600HP that gets 16MPG with a Holley Tunnel Ram and 2 Holley 660 Carbs

[@bobwhite5440]

phenomenal video. you are sharing carb tuning secrets that very few or zero carb tuners will. you're also doing it with language that everyone can understand. great job. keep up the outstanding work. more, more, more ...

[@UnityMotorSportsGarage]

Thank you for the kind words... I want people to learn all that they can... Even from my mistakes along the way! Because people are so quick to dismiss the carb and say FI is sooo much better and while I'm a fan of FI.. I know what can be done with a properly tuned carb..

[@mustangandfrankenstein]

@@UnityMotorSportsGarage ahem to passing on the knowledge .i agree with ya 100 percent .can I drop my blown up notch back off to ya and have ya do that to it.its got the same setup kinda .460 dual holley 600s.let me know brother and keep the videos coming.love em.besafe.

[@19jody72]

Man..I'm really liking this channel!

[@UnityMotorSportsGarage]

Jody, Thank you Sir!!

[@rickyhunter3514]

Here from uncle tony. Digging the channel bro.

[@UnityMotorSportsGarage]

Thanks for coming over and Subscribing!!! Please help us spread the word about the channel. Andy

[@jeffrey4547]

u know u can get a lot more out of it we got 25 mpg out of a 327 and it had over 1200 hp on the dyno with only pump gas no nitro but that was a real expensive build and we were running right around 12.5 to 13 to 1 on pump gas and i get a kick out of people saying u can't go over 10.5 to 1 on pump gas it is actually 13 to 1 is what u can't go over or the fuel will dentainate with out spark that is by the book but if u go over 10.5 to 1 u will need to build it for it that is were the tunnel ram shines but u will need to know how to run a peddle or break lose a lot this sets the drivers apart

[@kevinjennische8209]

Gr8! videos, if you put a little chapstick on those carburetor gaskets they won't stick.

[@UnityMotorSportsGarage]

That is a good trick, I have also used WD40 with good success.. Thanks for Watching!!! Please Subscribe and help me spread the word about the channel! Andy

[@StupidFastTruck]

Great video! Carbs are a lost art these days. Using a wideband to dial it in was really smart, your knowledge of the various circuits in a Holley is impressive.

[@UnityMotorSportsGarage]

Thanks for the kind words!! I have always loved working on Holley Carbs and they can be WAY more adjustable than people believe... I Love the new Fuel Injection systems that are out now... but the Holley Carb is far from Dead!!!

[@cuzz63]

@@UnityMotorSportsGarage seems like they arent all the adjustable if they need to be drilled and tapped. Seems like a good carb engineer would have designed it so you could make minor adjustments easily...change jets to get in ballpark then a screw on the outside to adjust for fine tuning.

[@UnityMotorSportsGarage]

Most of the Carbs The XP/HP Holley's and Just about all Quickfuel carbs and many others you can buy today have these features.... But 99% of people don't bother messing with these circuits because they don't really understand what they do! Andy

[@cuzz63]

@@UnityMotorSportsGarage cool, I wasnt aware of that, my Holley is older and doesnt have that but it runs decent but sucks gas. Your right its a lost art, I know back years ago I hated Holleys but nobody I knew was this knowledgeable about them and we didnt have KZbin or the knowledge to do the research, couldnt get books on Holleys at the library.

[@jeffmiller2682]

I got 18 mpg 450 hp on a 302 ford weiand tunnel ram 2 holley 600 carbs 351 heads 194 160 valves 101/2 to one comp forged pistons a lunati cam street grind

[@Cobra427Veight]

Not sure how much advance you are getting from your vacuum advance canister but there may be more power and economy in a ecu based advance curve and with 45 degrees at light cruise .

[@UnityMotorSportsGarage]

I'm getting close to 50° !!! I have hit the lean burn limit of the engine.. David Vizard taught me how to maximize a vacuum advance... Mallory used adjustable vacuum canisters on their distributors before MSD bought them.. with plenty of time... You can get it dialed in.. I'm sure with a ECU it could have been done in Seconds! LOL... Thanks Brother for watching.. I'm planning a video on what David and I did.. It's going to be good! Andy

[@richardreaves5007]

Great job Andy. You really opened up my eyes on Holly carbs, never knew there was so much adjustability in them for street performance. Got to say really learning a lot through your channel. Keep up the Great work!🏁

[@UnityMotorSportsGarage]

Thanks Brother! It is amazing to me that the engineers back in the 50's covered all of these bases who designed the Holley 4150/4160 series.. because it has changed very little through the years! Andy

[@flinch622]

The mod [12:00] to get tunability on the transfer slot is gold. Dual quads kind of bends original design into areas that need a little help. I assume it was sized down?

[@UnityMotorSportsGarage]

When you run a setup like this trimming fuel from the idle and transfer slots is key to making it happy! Thanks for watching Andy

[@davidandrew2610]

Hi Andy , I really enjoyed your latest video mate . Huge holley fan here , a question . Did you dial in your accelerator pump circuit , as in pump cam profiles , discharge nossles , as it also serms to be a misunderstood aspect of tuning . Thanks Andy I am enjoying your content mate . 😎👍

[@UnityMotorSportsGarage]

Thanks for the kind words!!! I will do a video on that coming up! Please help me spread the word about the channel!!!

[@jeffk6941]

I've always loved the look of a tunnel ram set up, but I never feared lining up against one ( back in the day, on the street ) because you could almost guarantee they ran like garbage. You are making me a believer for sure. Also, I love the driving footage. How about some in cab track views.

[@UnityMotorSportsGarage]

Thanks for the kind words!!! I think my second video is at the track In the truck... I love my Tunnel Ram setup... It trips people out when they see how easy it drives! Andy

[@600lwp]

I had that set up on a 350 68 camero and it got 15 as long as you drove it right but it had a 350. gear, but if you started doing hole shots and running 130mph to impress friends you could watch the fuel gage dropping

[@exploranator]

@@600lwp Time for a bigger fuel tank! :D

[@flinch622]

Speaking of looks... is that plenum cover reversed? Most manifolds are topped with compensation for engine tilt built in for level base.

[@testpilot6456]

Ive been using wideband tuning on all brands of carburetors since 2005 & yes other than cold start performance ,they behave just as good as fuel injection ,provided you tune the circuits as Andy mentions . I believe Andy maybe referring " racing fuel systems " on tapatalk in relation to the transfer slot jet info. Thanks Andy for sharing this info & dispelling the fuel injection is better myth.

[@UnityMotorSportsGarage]

That is it!!! Racing Fuel Systems... There are alot of good folks on there... Thank you for the kind words!!! I love tinkering so Holley Carbs are My Thing!!! Thanks for Watching.. please Subscribe and help me spread the word about the channel! Andy

[@happyhermit6899]

Excellent video Andy. Great information. I will surely use it in the future. Keep the great videos coming. Thanks.

[@UnityMotorSportsGarage]

Thanks for the kind words... I hope you get some great use from my tips...

[@fuelseeker4823]

What is the reason ore advantage to have a Ifr in the metringblock AND later in the Main body again ? Fuel supply to the t-slot = controled with the ifr, fuel to idle have the same well, but ist controled with the ims ? I Greetings from germany

[@UnityMotorSportsGarage]

That is a good question... It's all about the area of the Transfer slot. Even though it pulls fuel from the IFR if the slot is too large it will be rich! Most aftermarket billet baseplates have the slots cut too large. I hope this helps! Thanks for Watching Andy

[@mattrosenboom4810]

I had a pair of highly modified 660's. My friends always borrowed them for the strip. They made awesome power! They would whistle loudly the farther you poured on the gas. Power absolutely! Mpg's non existent! More like gallons to the mile!

[@firebirdjone]

Excellent explanation, some of which I've practiced doing on my own stuff for years. When you have time, I'd like you to elaborate more on the transfer circuit where you drilled and tapped the main body. Those holes are rather large on the holley as you know, it took a 10-32 tap, not the typical 6 or 8 size that I use in the meter blocks. That's a lot of fuel to meter down so I could see how that has a huge affect on economy. All my holleys run pretty much the same way, with idle and WOT showing nice AFR's on the wide band, but part throttle or light throttle cruise is pig rich. Can't fix that with a jet change without messing up the WOT. How much did you reduce that orifice in relation to the size it originally is? I realize it's different for everyone but are you just reducing that 10%? 20%? Cutting it in half?

[@UnityMotorSportsGarage]

Thanks for the kind words... It really took some time getting the Transfer slot fuel curve dialed in... I have found that most aftermarket Billet baseplates have a WAY too large transfer slot... I have seen them be almost double the width of a stock Holley baseplate and I guess they don't understand how they can affect the fuel curve.. On some mainbodies I have been able to use ,8-32 set screws but the vast majority will take a 10-32 screw... I started out with a .079" orfice it was still way too rich... From there I went to .065" and that was WAY too lean.. from there I ended up at .071" and seems to be sweet spot.. I would say that it cut at least 40% fuel usage in that area... But it took a while but was definitely worth the effort!!! If you like what we are doing please Subscribe and help us spread the word about the channel!! Thanks Again Andy

[@firebirdjone]

@@UnityMotorSportsGarage Thanks Andy for the quick reply. Wow that is more than I expected. A #21 drill for a 10/32 tap is .159" and that hole generally isn't much smaller than that. So it's safe to guess you probably cut that nearly in half with a .071" orifice. Did you use a percentage of how rich you were at light throttle cruise compared to where you wanted to be to come up with a ball park? For instance I'm at 10.5:1 light throttle cruise, so moving to say 14:1 is a very big change. A little over 30%, so there is a lot of fuel mileage to be gained in this area. Good stuff, keep it up.

[@bobwhite5440]

@@firebirdjone i don't know the original hole dia in the carb, but based on the .159 dia tap drill and your "guesstimate" of the original hole dia, the area reduction using the .071" dia orifice should be around 70% give or take.

[@firebirdjone]

@@bobwhite5440 Thanks Bob, that's quite a change.

[@bobwhite5440]

@@firebirdjone you're welcome. i don't know the transfer slot dimensions on the 660 center squirter, but the ones on a R1850 600 CFM i measured as best i could are approx .26" tall x .024" wide which renders an area of .00624 square inches. this is smaller than the "guesstimated" hole dia i used (.134" dia) in my previous calculation. so it looks as though the transfer slot area is the metering orifice instead of the hole in the main carb body (as well it should be). so the .071 dia orifice would reduce the assumed .26" x .024" transfer slot area by about 36% give or take. these are just example values used as reference, all the dimensions off of the 660 carb would be required to calculate the % reduction properly.

[@thomasleclair7418]

,,,,,Great to find another mind that functions on an Engineering level......

[@johnwilburn]

Amazing..... I've worked with Holleys for years and learned a bunch of stuff!

[@UnityMotorSportsGarage]

Thanks Brother... I learned a ton from David Vizard... He took me under his wing over 15 years ago... I owe all of my Holley tuning ability to him! People don't give Carbs enough credit... If you have a Wideband 02 you can dial it in just as good as ANY fuel injection... You just have to invest the time... People now days want everything here and now... So when are we going to get some of those Transmission vids??? Andy

[@johnwilburn]

@@UnityMotorSportsGarage It'll be a little while on the trans just because I’m doing a project and just posting what I do as I do it. The engine and transmission will probably be a winter time thing. I love carburetors!

[@blair79bear38]

I picked up my wide band from Innovative Motorsports back in 2006. takes the guesswork out of tuning my QuadraJets

[@UnityMotorSportsGarage]

You are so right!!! It opens up a new world of tuning... People don't know how much they are leaving on the table...

[@jbuch66koop]

Great video brother! I'll probably definitely be in your inbox with questions haha and are we just gonna sit here and act like we didn't see those slanted carb spacers????? Lmao you're gonna need to do a video on that. That looks to present a whole other bag of issues within itself. Haha well mounting issues anyway. It's gotta do something though, if you guys are not running traditional spacers. 😎

[@UnityMotorSportsGarage]

Good Catch.. I've been testing the spacers... Because I noticed on my Datalogs that on the launch the AFR would go crazy rich then stabilize.. so I found that Offenhouser made these plates for Circle track racers. I put them on and it "helped" my problem but it still isn't solved yet... I haven't noticed any major difference in driving around town though... I will probably do a video on this subject here in the near future!

[@jbuch66koop]

@@UnityMotorSportsGarage huh, thats definitely a wierd problem to have. Most cars go lean. I would think a float level issue, would bring other problems, if that was the case?

[@UnityMotorSportsGarage]

@@jbuch66koop you are thinking on the same path I was.. I did some crazy testing.. I have a good place were I could do some "testing" so I put new plugs in the motor.. went and did some test hits and killed the engine right after. I found the cylinders that were going Rich! 2/6 4/8 and that is when I found out what was happening!!

[@josephnubile1970]

That Was Awsome Andy, but do you go to the drag strip first before you do what you did or after? Because every carb needs to be tuned at the strip for the best time and you will need to change jets to get the best result.

[@UnityMotorSportsGarage]

When I first went to the track I wanted to do a true back to back test.. of the Carbs.. then I wanted to run it on the Dyno in the same trim as I made the runs down the track.. when I had the 1850's on it.. it ran pretty much 12.7 and I wouldn't have to change anything as long as we didn't have a huge swing in temp... Normally I will rejet when I see about a 30 deg change...

[@marcchaffee7751]

i got better millage with 2 carbs over 1 on my 289 also . About 14 to 16 mph . Hell , my tunnelrammed 351 cleveland gets 13 mph ! But passing a GM product up hill drops to 5 . lol .

[@UnityMotorSportsGarage]

That's pretty funny Mark... Mileage does always seem to go down when you see a GM product!!! 😆

[@marcchaffee7751]

@@UnityMotorSportsGarage lol , for some reason he thought he was gonna get ahead of me ! That silly boy , not sure what he was thinking . lol .

[@Jimmyk63]

Thank you for your insitghts and video 🙂❤👍

[@derekmcdonald2856]

I have that same bit set! Got the bits and pin drill from Mc-Master Carr

[@virtuestreams2616]

Researching questions, exploring plausible solutions, and testing outcomes are qualities of independent thinkers: well done! Sharing knowledge, on the other hand, reveals one’s passion, generosity, and altruistic nature-thank you and congratulations as you are a teacher. Peace-out!

[@UnityMotorSportsGarage]

Hey that is what it is all about!!! Sharing knowledge! Thanks for coming over.. please Subscribe and help us spread the word about the channel!!! Andy

[@zAvAvAz]

Hey thank you soo much for an awesome car channel and a great ride.

[@rong4189]

Great video. I didn’t understand the power valve restriction area when you said it should end up at 73 or 74. 73 or 74 what? Is it a percentage of the main jet area? Thanks.

[@UnityMotorSportsGarage]

When you add the area of the PVCR to the main jet size (in my case im running 66 jets) At wide open Throttle when the PV is open the carb would act like it had 74 size jets in it.. So if you find the perfect jet size on the main circuit that delivers a good AFR then you should adjust the PVCR's for WOT performance... but I never hear of people doing that.. they just swap jets and then complain about how bad of fuel mileage they get.... LOL Thanks for Watching.. Please Subscribe and help me spread the word about the channel if you like what we are doing!

[@rong4189]

Ok thanks. Yup, already subscribed and spreading the word!

[@rong4189]

Ok thanks. Yup, already subscribed and spreading the word!

[@hamishfullerton7309]

16mpg gee ,tunnel ram,truck bigblock,Gee that's impressive, very highway driving 🤔

[@UnityMotorSportsGarage]

Hamish it's was a 393 stroker Windsor small block.. it would get 16mpg around town and would drop to around 13-14 on the highway due to the 4.30 gears... It needs overdrive! Andy

[@woodey028]

Andy.. what carb spacer are using? They look to be tapered. Also, are the 660s base plates aftermarket? They look like billet aluminum.

[@UnityMotorSportsGarage]

Yes they are tapered, to help control fuel slosh on the launch.. the baseplates are billet that came from Allstate Carbs! Thanks for Watching Andy

[@rokkebill]

You sir are the MAN ! Thank You so much for this video. Everyone talks about jetting bla bla bla, when as you said, the fuel economy is in the transition circuit + manifold adjustable vacuum. I`ve tested this in my 502. Put in 99 jets front and rear. A/f ratio stays the same as before up until 2450rpm cruising, then the main circuit kicks in with barely leaning a mm on the throttle. This video was a great way to show us how it`s done for real. Can`t like this video enough. Thank You again Sir !

[@UnityMotorSportsGarage]

Thanks for watching! and you are correct... Its about making all of the circuits in the carb work together! Please Subscribe and help me spread the word about the channel!

[@michaelstrangefranke7002]

That's incredible 16 MPG I have a 2000 Dodge Dakota RT with the 360 fuel injected completely stock and I'm lucky if I get 16 MPG on the highway I think I'm around 14 maybe 15 MPG

[@UnityMotorSportsGarage]

It's funny when I built the truck gas mileage wasn't even on my radar!!! Once I installed the Fast dual Channel wideband.. I just kept messing around and kept tuning on the carbs until it drove like it had Fuel Injection... I began to notice the gas mileage and so I decided to check it one day.. I was getting around 13 mpg... I was shocked... So I kept trimming fuel from the idle and transfer slot circuit and I was able to get 16mpg!! I do have to keep my foot out of it though and that is hard to do!!! Andy

[@michaelstrangefranke7002]

@@UnityMotorSportsGarage yeah I know if I had that truck I want to put my foot into a time or 2 👍

[@DS-es7id]

The trans did not shift when you smash the throttle, I have been wondering if that is the high stall converter that causes that type of reaction from the trans? If that is the case (if you don't mind) What type of trans, and what stall speed are you running?. It really sounds and looks like the way to go for drag applications. I( would like to get in the planning stages to put something similar together. Thanks for all the great knowledge!.

[@UnityMotorSportsGarage]

Thanks for watching, this is a C4 trans with a Manual Reverse valve body .. I'm glad you enjoyed it Andy

[@terrycarter8929]

I think Edelbrock watched this video and used your info to make the new holley clone carb. It has many adjustments on it. You should compare their new carbs to the ones you have now.

[@UnityMotorSportsGarage]

You might be right Terry! I can't wait to get my hands on a set of them... Should be really good Andy

[@happyhermit6899]

Do you use the single or dual sensor FAST unit?

[@UnityMotorSportsGarage]

The dual sensor unit.. I know it is pricey. But for the amount of Knowledge I've gained not to mention the fuel consumption I've saved... It has more than made up for it!!!

[@happyhermit6899]

Unity MotorSports Garage thanks for the reply.

[@jeffhooper7873]

Did you have to change carb body's to install power valves in sec. Side or machine yours

[@UnityMotorSportsGarage]

That is a good point... My 4224's were old and had the channel for the power valve in the mainbody. From my experience the older 4160's had the channel cast in them and the later ones have the solid flat surface. Thanks for Watching Andy

[@overbuiltautomotive1299]

16mpg and no OD i assume be neat to see it with a 6 speed as i am a stick man or gear venders od or :} 4l80e ;} rigged up on it

[@UnityMotorSportsGarage]

I'm getting ready to put a CASPER-MATIC in it... E4OD with a reverse manual transbrake! Andy

[@mikecondoluci53]

GREAT VIDEO MAN 2 THUMBS UP, JUST SUBSCRIBED THANKS

[@UnityMotorSportsGarage]

Mike thank you for watching and for the Sub! Andy

[@TheSlim93gt]

Nice work and info. Carbs will never meet the MPG of port fuel injection though. It makes a huge difference where in the port the fuel is introduced and good luck getting a carb to fuel cut on deceleration and cruise.

[@UnityMotorSportsGarage]

Thanks for the kind words, Carbs can rival injection but in the end I do give the edge to FI due to cold start capability.... You are also right on Carbs cutting fuel on decel... the key to that is having a properly tuned vacuum advance to put in as much timing as the engine will... Most engines can idle leaner than 15 to 1 AFR, Ive seen over 20 to 1 working with David Vizard, it takes a very strong ignition system to make that happen... Thanks again for watching and please subscribe as I have more good content coming up.. Andy

[@yeboscrebo4451]

Awesome! I’d love to acquire your skill level. Bought a crumpled 69 f250 last year and I’ve been steadily working on it. Have it looking spiffy now and I’m excited to dive into the world of tuning.

[@UnityMotorSportsGarage]

It's fun to tinker with these old machines... Hey I went through the school of hard knocks.. and I give a ton of credit to David Vizard!!! He is a genius...

[@transformationclass5054]

These leaks were my issues. Thanks so much for this awesome video.

[@UnityMotorSportsGarage]

Good stuff! I'm glad it helped Andy

[@deanstevenson6527]

All the things David Vizard taught from 1977 to 1988 you are doing. What a great disciple to the craft of making carbs work Andy. Thanks for sharing!

[@UnityMotorSportsGarage]

Thanks for the kind words!!! He is my mentor... Great guy Thanks for Subscribing to the channel! I hope you enjoy the content Andy

[@deanstevenson6527]

Unity MotorSports Garage : Love it All Sir.

[@wolfspeed9043]

Your giving us gold freind!! Thank you

[@UnityMotorSportsGarage]

Thanks for watching! I'm glad you enjoyed it Andy

[@johnpino5150]

Also you locked out your distributor or running some mechanical advance lie 8 or 10 degrees built in for mileage. Locked out with tunnel rams has always worked best for me unless high compression or timing fighting the starter kicking over. I've never had that problem but heard of others complain about it. But big picture who cares about mpg with two 4s and tunnel ram. Haha. I just want afr good at idle part throttle, smooth transition from cruise and from dig to floored.

[@f-bodyjon2189]

thumbs up sir!

[@UnityMotorSportsGarage]

Thank you Sir!

[@johnvegar9098]

@@UnityMotorSportsGarage I just watched your engine fan dyno test and said the truck has around 400 ft. pounds of torque. Another video you say the truck has 600 HP. You telling me the motor makes 600 HP but only 400 lbs. Torque? That does not seem right.

[@galaxievideoproductions8783]

Awesome video! I’ve got a Weiand tunnel ram with 600s and I’m in the process of tuning out an off idle stumble/bog among other issues like A/F ratio. I’m going to try using power valve block offs or 2.5’s and I put in 76 primary jets. It’s got a huge duration camshaft and pulls about 7 to 8 inches of vacuum at idle it’s idles at 1300 rpm. I was also going to change the accelerator pumps to 50 cc. I was wondering if you could help me choose a squirter size.? I was thinking of trying 37’s as a start. I like the idle Circuit trick too. Thank you for your time and your great knowledge.

[@UnityMotorSportsGarage]

Galaxie, thanks for coming over and watching... Please Subscribe and help us spread the word about the channel. On your setup. If this is to be driven on the street I highly advise NOT removing the power valves but find the one that "comes in at the right time". On my setup I have right at 10" of vacuum at idle and I found that 6.5's worked pretty well.. you will have to see what your setup likes... On the idle stumble, I did everything Cams squirters, etc.... It wasn't until I went to the 50cc pumps my problems were solved. My combo worked really well with 31's for squirters.. the key was having the pump shot to last longer to cure the off idle stumble.. but once I did the above mentioned things I could stage my truck at slightly above idle.. 1500 rpm or so and on the last yellow just mat the throttle and that has given me my best ET to date. I hope this info helps you and if you have any more questions... Feel free to ask.. Andy

[@galaxievideoproductions8783]

Unity MotorSports Garage thanks so much! I do have 31 squriters and it was a toss up between those and the 37’s. I’ll try those along with the 2.5 power valves. My cam has sooooo much overlap it’s ridiculous. When I’m driving and come off idle the vacuum drops to just about zero. The power valves open and I get super rich. BTW I’m running 456 gears and the hesitation is only for a nano second. More annoying than anything else. Once I get past that she runs like a scalded dog. So I think jetting is ok. Thanks for your input and I’ll keep you posted on the progress

[@williamturner2617]

@@UnityMotorSportsGarage I want to thank you for helping everyone who wants to have a tunnel ram and be able to enjoy driving their vehicle. Thanks again. Will.

[@hoost3056]

There's no shame in using a wideband. OEMs have been using them forever ( 4 gas analyzer ) to develop their engines. Ought to look at some of the fuel economy contests from back in the day....they were getting silly economy numbers with carbs and points.

[@UnityMotorSportsGarage]

You are so right! Most people today, think of Carbs as old tech which it is... but that doesnt mean that it cant be made better! There is SO much more than just changing jets.. lol Thanks for Watching and please Subscribe!

[@hoost3056]

@@UnityMotorSportsGarage im already subbed👍 This video and your nitrous Mustang did it for me

[@codygentry9472]

What rear gear and trans lets you get that thing to 120mph??

[@UnityMotorSportsGarage]

It's a C4 automatic with 4.30 gears

[@victorriceroni8455]

Excellent. Using modern tech that incorporates the supercomputer between your ears instead of taking it out of the loop.👍

[@UnityMotorSportsGarage]

Thank for the kind words!! I have found I can make those Carbs work alot better than anyone gives them credit for... It just takes time and a bit of effort!! Thanks for coming over.... Please Subscribe and help us spread the word about the channel!!! Andy

[@davidjohnson4304]

Glad to have found your site. These are the very best that I have seen. I'd really appreciate your thoughts and recommendation's on my application. I have a BluePrint 427 SBC with 220 CC heads. 10:1 compression. a .577 / .577 roller cam. It dynod at 555 Hp / 565 Trq. This is in my 67 Nova SS, Muncie M21 4 speed, Moser 12 bolt with 3:73 gears .I'd like to put on a dual quad tunnel ram set up. There's so many combinations out there, I need an experts advice. What intake, carbs and would the cam need to be swapped ? Thank you. Dave.

[@reevesautomotivefarm9614]

very much interested in the mpg content. i get 12 mpg on my 76 K20 towing rig and used to get 16 on my 69 Nova 327 340 horse but it is worn out. built it in 91. new motor 327 agian but dart block diamond pistons very small solid roller 224@.050 .525 jesel lifters. daily driver. i am that guy at Mr. B's in Rock Hill, SC that wants to talk about MPG, LOL

[@spyder2383]

I've had a 350 with an offy tunnel ram with 2 600 hollies, or 1 750 double pumper. Ran 4 mpg with a 4 speed and 4.11's . I've got a vdrive with a 468 offy dual wafb's, light throttle under 40 mph, not bad, wot or 70 plus mph and I think it has negative mileage. 402 chevy 2 afb low rise, 8 mpg. If you get 16 that's a he'll of an egg under your gas pedal. Lol

[@frankchapa4165]

...damn that little small blocks sings beautifully!!!👍👍

[@UnityMotorSportsGarage]

Thanks for the kind words!! I sure have high hopes for project MIXED UP BOSS!

[@davescbradiorepair8195]

What size is it?

[@UnityMotorSportsGarage]

It was a 393 Windsor MIXED UP BOSS is 429CI Andy

[@freelancerider100]

Excellent understanding of fuel circuits! The a/f meter takes the mystic plug readings out of play!

[@flinch622]

You know whats sad... my Tacoma [6 cylinder] got 16mpg around town - and its missing probably 420hp by comparison. Clearly, engineers are coming in 3rd place behind government and lawyers telling car companies what to do. But I wonder how it's different between resizing IFR from the addition of new metering "jet" [as you put it] in the mainbody where you drill/tap for the transfer slot feed? I would think they would serve the same function, or... is there something regarding idle bleeds/screw adjustability that forces this move?

[@SimpsonsSpeedShop]

Great video! Man you have done some work on those carbs! Amazing. Great job 👏🏻

[@UnityMotorSportsGarage]

I hope you can use some of it to help you out. Feel free to message me on Facebook if you have any questions... Love your channel man... I'm a sucker for A bodies! Maybe one day I will have another one.. Andy Wood

[@johnpino5150]

Isn't that why you change your power valve first then your pump cam then your jets. I know what your saying makes sense but won't power valve control the amount fuel through there going from like a 8.5 power valve tho 6.5 have same effect. Or is that where your saying if you have downleg boosters vs annular booster. My carbs are the weird ass no secondary squirter 450 cftm tunnel ram carbs 9776 I believe. And I know I need to change power valves but just pump cam change and changing jets on my 273 tunnel made a huge difference with just pump cam change then I dropped jets from factor down about 6 sizes and I get 20mpg with my 4speed 294 gear and light car and aluminum flywheel. I really want a wife band the I can tune from each header and eventually bung on each header to optimize my next motor. Those weird 450 cam mechanical secondary carbs with no secondary squirters do work good on my smaller motor. I was having trouble with getting changes with 4 corner idle adjustments till I changed jets. But there is zero hesitation and no bog like alot of people complain about after pump cam change and couple jet changes. But I know power valves need changed to better match the smaller 273 but maybe on the .04 over 318 with 10.1 and 2.02 360 heads power valve will be fine but im curious if you set screw restrictions are just changing power valve function or if fine-tuning after you have done a power valve change. Or with my carbs having metering block on primary side and plate with no secondary squirters is whole other animal. I know once the 4.56 gears go in probably gonna have to return carb but bigger motor will change same time so who knows. Just curious if power valve change would have same or similar results as your screw in offices behind power valve I know if transfer slot not set right your 4 corner idle can be non responsive to change and that drilling hole in primary throttle plates isn't the right fix. Ive seen air bleeds changed and that helped with transfer slot and idle adjustments work better from idle to opening throttle making for snappier throttle correct? Again I know these 450cfm are weird setup but been great on my tr5 tunnel rammed 273 in light 4 spd car that doesn't need all the extra fuel when floored but may be hard to rune for most or a 460 480 hp motor that's smaller and built to rpm and Rev quick so will see when next motor gos in. But got me curious on tbos power valve restrictions vs power valve changes.

[@kurtgangelhoff3364]

I've liked you videos I have a 350 Chevy with a mild Cam and Edelbrock 4-barrel I would like to go with a dual quad tunnel ram setup with two Hollies could you please advise me on what tunnel ram intake to purchase and what two Holly carbs I should use as far as cfm's thank you

[@stuartbuckley8720]

Can you give us a address to get these jets and parts along with the tools needed to do this please. I have 2 600 cfm Holley vacuum secondary carbs on a tunnel ram that I am going to use on my 8-71 super charger on the street. I think this will work well for me. 20% under drive on a 434 sbc.

[@UnityMotorSportsGarage]

Stuart, You can go to mcmaster.com to find the stuff needed to do these mods.. You will be surprised about the improvement you can make!

[@stuartbuckley8720]

@@UnityMotorSportsGarage thank you for your response and time!

[@UnityMotorSportsGarage]

@@stuartbuckley8720 anytime!

[@jackhackman7777]

If the truth is known carburetors are better than fuel injection in gas milage And if the truth is known cars and truck should be at least 100 + mpg Especially with today's technology in 2021 Imagine how much cleaner the air we breath would be

[@PaulE.Fredette-bq1zg]

What About When You Get Up In To A Different altitudes I live at sea level but a lot of places around here to go up a couple thousand feet so if I'm in Nevada I'm driving to Utah there are so many different altitude changes and temperature changes I like what you doing

[@MrTaylorTexas]

I just got my Innovate wide band installed . I'm already learning new things about the carb, and I'm even more amazed by the "pre computer" engineering of them.

[@177SCmaro]

Fundamentally, this isn't that different from modern efi engines (LS, Coyote, Hemi...) except they're designed just to flow air. They all use, essentially, tunnel ram manifolds just rolled up to clear the hood. If you straighten them out and put a couple carbs on top, you'd have basically this. Getting this level of control from a carb or carbs is challenging.

[@UnityMotorSportsGarage]

It isn't hard to get Carbs to work well... They are a very Analog device that requires us to be the computer.. in fact you can get fuel injection type performance out of them. Just takes a bit of time and patience but once you get them right you are good! Thanks for Watching Andy

[@britdragster]

Hi Andy. Superb video as usual. Do you have a link to the video for the carb sync tool you made? Thanks.

[@PaulE.Fredette-bq1zg]

So U Uncle Tony's garage did something similar I said they were getting like 17 and he takes you through the steps that he goes through kind of like what you did

[@onthemicwithtarencebaileys5684]

What engine are you running?

[@UnityMotorSportsGarage]

It's a 393 Windsor.. Thanks for Watching! Please Subscribe and help us spread the word about the channel! Andy

[@olderthanyoucali8512]

Which episode shows the 600 horsepower dyno run? I watched one where 422 h.p. to the rear wheels in shown, but that converts to around between 500 to 535 horses?

[@UnityMotorSportsGarage]

When it was first built we ran it on the engine dyno in Mooresville NC.. you can see it in my CASPER slide show video...kzbin.info/www/bejne/bJS5aI2LiKqribs

[@olderthanyoucali8512]

@@UnityMotorSportsGarage so with the early high rise, you made 600, then after replacing it with a later style high rise you made less horsepower at the wheels than you should have with, as you said when drag racing it, higher power levels than before? So what's eating close to two hundred horsepower? One or the other dyno pulls weren't accurate? Can you please explain. By the way, enjoy the content.

[@UnityMotorSportsGarage]

@@olderthanyoucali8512 It made 575 @ 6500 flywheel with the old Hi-Ram "They" wanted to pull it to 7k and I decided not to.. as it had a Scat cast crank it would have probably peaked at 6700 give or take

[@davidreed6070]

Smokey yunich was in on designing Holley carbs wasn't he ,I bet David knows.

[@ToddWright2]

Mark Whitener's forum. It's very good.

[@robertclymer6948]

I noticed your carb spacers run at a forward angle? What is the purpose for that Andy? Thank you.

[@UnityMotorSportsGarage]

Robert, I use them to help control fuel slosh on the launch... Works pretty well Thanks for Watching Andy

[@robertclymer6948]

@@UnityMotorSportsGarage Of course, oh duh me. I have a spacer I want to put under my 750. Will that change the tune? I tuned it last time with a vacuum gauge Thanks for sharing your great knowledge for us weekend hotrod mechanics. Have learned a lot.

[@UnityMotorSportsGarage]

@@robertclymer6948 it can change the tune slightly... By adding plenum volume it weakens the signal to the carb slightly... Alot of factors come into play but intake type and spacer type... Experiment and see what your combo likes... Thanks for the kind words! Andy

[@robertmoon906]

I think I missed it, what size engine you have there? Thanks.

[@UnityMotorSportsGarage]

Robert, it's the magic number 429" stroker Windsor... Thanks for Watching Andy

[@UnityMotorSportsGarage]

I'm sorry... That was my 393w the new motor MIXED UP BOSS is 429" Andy

[@prettyboyfloyd3397]

GOLD info Andy 👍👍👍👍

[@UnityMotorSportsGarage]

Thanks!

[@autonomous_collective]

What rear-end gear ratio?

[@UnityMotorSportsGarage]

Casper has 4.30 gears

[@terrysibley9636]

So do you trick out carbs for other people. Nice truck by the way.

[@UnityMotorSportsGarage]

Terry, I used too but it really requires having the vehicle to get the combo dialed in... Thanks for the kind words about CASPER.. You will be seeing more of it soon! Andy

[@terrysibley9636]

@@UnityMotorSportsGarage good morning from AZ. Thanks for the reply. My 306 ranger is currently apart. Had a lifter go away. Was a lot of fun for 6 or 7 years. So as all good motorheads go putting it back the way it was really wasn't an option. LoL. You know more time, more money,more of my wife shaking her head. Bottom end is at the machine shop. So we are moving forward. Combo as parts are being acquired, pretty tight solid roller, comp. We're calling it 10.8, 10.9. 5 speed with 3.73. Out back. I guess since I don't know will this be enough to even get any good out of a tunnel Ram. It's a highway star when it's on. Anyway any info is good info. Have a great day,

[@tetanustv6258]

Question. I am running 660s on a Weiand tunnel ram equipped 440. What metering blocks are you using to have power valves? Factory has them blocked and 76 jets. Any information would be greatly appreciated. Great videos, I love the detail.

[@UnityMotorSportsGarage]

I ordered 4 primary blocks for a 1850 600vs Holley.. they work great but you must modify your baseplates to convert to have 4 corner idle mix screws.. if you don't want or need the 4 corner deal you can just bottom the mixture screws out and just use the Primary screws Hope this helps Andy

[@tetanustv6258]

@@UnityMotorSportsGarage Thank you so much!! What is the modification that is needed in the baseplates?

[@UnityMotorSportsGarage]

@@tetanustv6258 it's not hard to do... But it's more involved that I can explained in a post... It would make for a good video down the road! You can find this info by googling it if you want to do it before I make the video! Andy

[@tetanustv6258]

@@UnityMotorSportsGarage Ok, thank you. Cant wait for more installments. Keep them coming and the good work

[@UnityMotorSportsGarage]

@@tetanustv6258 will do! Andy

[@armandomendoza3167]

So basically you balanced the carburetor fuel delivery system. By just adding mini jets based on the perspective of the main jets? To balance it in harmony to the fuel ratio goal? And you say you can get 16 mpg on the highway. How about in the city? What is your mpg in city driving?

[@UnityMotorSportsGarage]

Sorry for the late reply, but yes it is basically balancing the fuel system and by making all of the circuits in the carb adjustable you can dial each one in to get the most drivability, mileage, and Performance! Thanks for watching and please subscribe!

[@douglascrosby6536]

Mark and the guys (other forum admins) over at Racing Fuel Systems are sharp as hell. A lot of them also are over in the Holley wideband forums helping folks as well. Mark (and a couple others on there as well I'm sure) build custom carbs as a profession. Mark Whitener(?) I believe has "Lightning Racing Carburetors". Hella nice buy to give his knowledge away for free. He deserves some credit for that for sure!!

[@UnityMotorSportsGarage]

You hit the nail on the head, those guys are top notch forsure.. my overall goal is to show that you can get great performance and mileage with carbs, even with two Carbs!! LOL Thanks for watching and please subscribe!

[@thorny7138]

Thank you for this! I'm working on dual carb buick 455 project and your videos have been beyond helpful. Subbed. P.S. Found you via Uncle Tony \o/

[@UnityMotorSportsGarage]

Thanks for coming over! Keep me updated on that if you need any advice just email me at [e-mail] sounds like a super cool build Andy

[@smilsmff]

what is engine specs ,what camshaft, what heads etc?

[@UnityMotorSportsGarage]

This was a 393 Windsor with 10.7 to 1 compression, with David Vizard ported heads (flow 315 cfm @ .625" with a 192cc intake runner) a small solid roller cam 245/253 @ .050 .674"/.674" lift on a 108 LSA

[@raquelreddick7942]

@@UnityMotorSportsGarage what is trans and rearend gears if you don't mind . love the vid going to try this in a 78 Lincoln with a 460 maybe and 360 y block stroker maybe in something else. Learned alot always thought there was more could be done with carbs.

[@robertclymer6948]

Hi Andy! Man you took us on a deep dive today sir. Excellent info and I actually understood most of it, lol. I just run a single Holley 750 on a 460 BBF, so I don't know why this could not apply to it also. Step one, I need to get me an AFR gauge and take it from there. Thanks for sharing and cheers from Motown.

[@UnityMotorSportsGarage]

Robert you are 100% correct... All of this can be applied to a single 4bbl... You will be amazed at how well it works... Andy

[@michaelhartman851]

Yeah 16 mpg on the highway cruising, but I'm imagining with dual quads at full throttle 8 or 5 mpg is a decent estimate as well as an American tradition...

[@UnityMotorSportsGarage]

Its probably less than that!!! Andy

[@Haymaker_Jake]

What holley carbs are you running?

[@UnityMotorSportsGarage]

I'm running old school Holley 4224's 660 CenterSquirters That I've Modified to make streetable.. Thanks for Watching Andy

[@Haymaker_Jake]

@@UnityMotorSportsGarage that’s what I was thinking, any idea where a guy could get a set? Holley says they have been discontinued, and they were much too eager to sell me a dual holley sniper kit. If I were to find a pair of 4224s, would it be enough for a mild 460, on top of a weiand? I’d rather stay old school! Thankyou for the reply!

[@cabotbroughton7458]

Hello Andy, I am really liking your videos, but I would think a 2x4 would be a lot easier and less expensive to tune and achieve ideal economy and power a/f ratios throughout all the street strip operating range using carbs that have staged secondaries as opposed to the 660’s 1:1 action, or am I missing something?

[@UnityMotorSportsGarage]

Cabot, thanks for Watching.. with Tunnel Rams with 2x4's the thing is the amount of throttle opening required for a given speed is cut in half because you are opening the primaries on both carbs. The 660's have a slighty staged secondaries. You can open the primaries through the transfer slot range before the 1:1 kicks in... Even in my 4000lb truck I can go 70-80 mph and still be in the transfer slot! Hope this helps Andy

[@427_FE]

If you put a thin coat of chapstick on the metering block and bowl gaskets. it will eliminate the need to clean the surfaces of gasket material. Try it, once you do. you will always have a tube of it in your tool box! don't worry if a little gets in the small holes in the gasket. because the fuel will dissolve it.

[@UnityMotorSportsGarage]

Jeff that is good stuff! Andy

[@mridoit1701]

"Some people call it cheating" Well gas isnt 25c a gallon anymore

[@shanescrimshire8395]

Hey Andy, came over from UTG and lovin the content. Been a fan of DV's for over 20 years and super jealous of your access to the legend. I built a 302 for a 73 bronco and a stroker for a jeep zj using his principles. Both engines made me look like a hero, all thanks to him. Now I'm planning the rebuild of the 460 in my 79 f-body bronco. This one is pretty challenging. I live in California and it has to meet 79 smog standards.

[@UnityMotorSportsGarage]

Thanks for coming over and Subscribing... It sounds like you have an awesome project!! I tell you I'm very blessed to have DV as a friend and mentor! We have some great videos coming here in the near future! Catch ya later... Andy

[@MsKatjie]

I am glad Yoytube found this channel for me! Will buy Steve's book on Holley tuning for sure. Thank you, for sharing your knowledge and giving credit to the forum where you got the procedures from. Most would of claimed it as their own! Like with solid lifters and having to periodically adjust the lash; so to with a carb, initial dialing in is needed. That needs understanding and patience. The driver in the end, will be rewarded with both, " power and economy"! Cheers to you.

[@UnityMotorSportsGarage]

I believe in giving away that which has been freely given to me! Thanks for the kind words and please subscribe as I have more good stuff coming down the pipe! Andy

[@donnatalielucasheimbigner7598]

I really miss the look of my 68 from the driver seat. If you know what you're doing with a Holley, the only benefit of EFI is when you change altitude frequently. Great to see people sharing tips & keeping the carburetor alive & well.

[@UnityMotorSportsGarage]

I know these trucks are awesome! Thanks for Watching... More good stuff to come! Andy

[@bobmopar2587]

Do you have a video about building a Unisyn for tuning tunnel ram carbs? If so, can you post a link so I can watch it?? Thank You

[@UnityMotorSportsGarage]

Here you go! kzbin.info/www/bejne/iYPai4ONrahmick

[@pockets5628]

Finally someone who gives the correct info about tuning using pvcr and the benefits of transfer slot restrictors! The only 4150 style carbs I have seen which come with transfer slot restrictors from holley are some 600HP supercharger carbs.

[@UnityMotorSportsGarage]

Thank you for the kind words! Andy

[@jimkillen1065]

Many years ago I ran into a little of this now where even close to this level of understanding just a butt dyno type deal . I was trying to make a 750 holly idle in a econ rail with a small block chev . The motor had a lot of camshaft , probably to much . What I did was to install some 2.5 power valves . drill a couple of .125 holes in the throttle plate to by pass enough air to bring the throttle plate back down to where it wanted them .I had seen a tech on some hot rod mag that showed how to install a piece of wire to restrict the fuel I think also in the metering block . That was a long time ago . But it make the small block engine with a 600 isk roller and a lot of cylinders idle pretty decent with a automatic . . I do appreciate your videos and will watch them all thanks i i

[@UnityMotorSportsGarage]

Thank you! I've always been a hard head as my Dad would say... If someone would say it wouldn't work... I would try my best to get it to work... Why??? I don't know... Even though I'm 41 I just love carbs.. you can make them almost rival FI in every area.. except in the Cold start... I still want to get that figured out! Thanks for Watching and please Subscribe as I have more good stuff coming Andy

[@W_R50]

Excellent channel! Just found it. Loving that tunnel ram. “That was a quick 120 mph” sweet!

[@UnityMotorSportsGarage]

Thanks for the kind words and for watching! I will keep the content coming. Andy

[@oby-1607]

Sure wish I had access to the FAST Wideband meter when I was on the street with my setup. Tuning a tunnel ram with Holleys for the street is a lot different than for racing. I can't tell you how many times I had mine apart trying to get fuel economy and power. In my case, I cut a rectangular hole in my hood for clearance with no cover. It was great watching the velocity stacks shake when heading out for a cruise.

[@UnityMotorSportsGarage]

Having a wideband makes a huge difference in getting the Carbs dialed in.. when you have lean transition and main circuits the Accelerator pump circuit needs to be spot on when hammering into the power circuit! Thanks for the kind words and for watching Andy

[@blackrockbrewing5141]

I consider myself well experienced with Holley Carburetors, I have rebuilt several, used tunnel rams, built a few hotrods and raced at my local drag strip. I did not have this info, and I love that you break it down in bite size pieces that are easy to understand. Also, your resources are awesome, thank-you for taking the time to post and share this info with us.

[@UnityMotorSportsGarage]

Thanks for the kind words and for watching.. I'm just giving back what has been given to me over the years... Andy

[@dandutton4175]

2-4 tunnel ram. Power valve in primary metering block only? Rear metering block?

[@UnityMotorSportsGarage]

Dan, I added Power valves in the rear metering blocks as well.. From what I found out once driving it, Power valves in them wasnt all that necessary because in everyday driving you never get into the main circuits.. You are running on the transfer slots 95% of the time! Thanks for watching and please subscribe!

[@robertphillips3078]

Ur sharing stuff on Holleys that l haven't come across b4. Cheers Andy

[@UnityMotorSportsGarage]

Thanks Robert... That is my goal.. hopefully it will save some headaches and help make more power too... Im a graduate of the School of Hard Knocks University...lol

[@Mcscher]

What i need to know is i see people with tunnel ram & 2 vacuum secondary carbs with them converted to mechanical without a secondary accelerator pump without having a lean spot when all 8 are open.

[@UnityMotorSportsGarage]

That is almost impossible to do... On my Vac Sec carbs I tried and tried to do what you mentioned but, I found that by adding 50cc Accelerator pumps with 35 squirters and keeping the Vacuum Secondary function working! I also adjusted the secondary high speed airbleeds to start the main circuit come in faster... I hope this helps some but I will say this I love the Center Squirters soooo much better than the 600 VS carbs...Thanks for watching and please subscribe!

[@bobb9615]

Awesome channel man! I’m in the process of building a 73 mach one with a set of these mounted to a weiand tunnel ram on top a BBF 460.

[@UnityMotorSportsGarage]

Most people think of tunnel rams as a race only piece.. but once you get it right, it will give you the best of both worlds!! thanks for watching, and please subscribe!

[@RealDougFields]

I have 633 HP to the wheels and I get 17-18 mpg on the highway running 80-85 mph. I only average about 10-11 mpg average in daily driving though. BUT- It is a 2006 CL55 with a (modified) M113K AMG motor in it. You getting similar numbers with this combo is pretty cool!

[@chrisholcombe137]

I have a pair 660 Holley center squirt WILL NOT go different List 1970 6 months later List 1971 matched pair 4224-S This system brought down blown 454s A dual Point distributor (yes I said points) Doe's wonders !

[@UnityMotorSportsGarage]

Center Squirters ROCK!!! I love them for Tunnel Rams.. that 1:1 throttle opening is like none other... Thanks for Watching and please Subscribe as I have more tuning stuff coming up! Andy

[@deesel666ify]

Thankyou. Excellent informative video. Nice work

[@UnityMotorSportsGarage]

Thank you for the kind words! Please subscribe and help us spread the word about the channel!