I've been running quadrajets on street cars for years. A lot of people replace them with holley's because they are easier to tune. If you have a car or tuck that you drive long distances to car shows or power tours the quadrajet is hard to beat. The drivability is excellant and I've found the fuel mileage to be better. And there's some NHRA stock eliminator cars going really fast with quadrajets.
@testpilot64564 жыл бұрын
The Q-jet is much maligned & misunderstood carburettor ,ford even used it on their cobrajet ,if you understand them they can produce good economy & power.
@ThePaulv124 жыл бұрын
@DropDstar You're a man of class and style!
@VORTECPRO4 жыл бұрын
Yes the Q-Jet does work good on my NHRA stocker but.....................your forgetting one thing, it doesn't use a mech fuel pump, it uses a unstreetable Magna fuel fuel system with 25 lbs forward fuel pressure, with out this type of fuel system you would never be able to launch the car with out running out of fuel.
@thefinalroman4 жыл бұрын
@@testpilot6456 It's a piece of trash and luckily everyone knows that and gets a Holley
@idletime4 жыл бұрын
I'm a Carter AFB fan myself. I've worked on my fair share of Holley carburetors but always preferred Carter. 1 carburetor I always liked and thought was really cool and always had good luck with but never could understand why they didn't upgrade them from polymer to aluminum is the venerable thermoquad. I also agree the Quadrajet isn't a bad carburetor overall and when you learn how to Kuna with a vacuum gauge they're a pretty good carburetor overall I just never got the hang of rebuilding them. While I'm thinking about it I will mention the biggest piece of shit carburetor I have ever have the sad Misfortune of messing with was Holleys attempt to copy Carter with the model 4011 ( I think if I remember right). And just for fun I do think the Predator carburetors are interesting to say the least and effective for that matter just not the most readable carburetor for sure
@stuartcookie1334 жыл бұрын
i have rebuilt countless Quadrabogs as they are usually called and have NEVER seen that altitude adjuster! Learn sumthin new every time i watch Richards videos. Thanks Richard!
@richardholdener17274 жыл бұрын
Glad to help-It was new to me too!
@matthewwalsh87954 жыл бұрын
RICHARD!! I'm glad you dove into the Quadrajet brother, I've been building them CLIFF RUGGLES PERFORMANCE style for years, he's the best and most comprehensive Q-Jet expert I've ever researched, his Cartech book on the entire line of Quadrajet carbs is phenomenal, a must read for anyone who touches them.
@johnparrish92154 жыл бұрын
I didn't know about the altitude correction part of the Cadillac Q-Jet, that was very interesting.
@ComfortablyNumb19694 жыл бұрын
It was on more than the Caddy Q-jet. My parents had a 1974 class C motorhome that had a Chevy 350, that also had the APT adjustment.
@chrisrye91284 жыл бұрын
Worth consideration over fuel injection conversion with altitude compensator. Far less expensive even with a new/remanufactured Caddy Q jet. 🤔
@ThePaulv124 жыл бұрын
Some Thermoquads had it too.
@jordanwiley45824 жыл бұрын
It was a 75/76 only thing, for the most part. In 77 most carbs did away with it again, and by 1981 they were all computer controlled with a mixture solenoid, TPS, etc. 1990 was the last year, the 307 Olds in station wagons before the upsized roundy b bodies came out.
@ComfortablyNumb19694 жыл бұрын
I stand corrected. The APT adjustment that my parents motorhome had was different. It was a manual adjustment, that adjusted the primary metering rods, and was not the automatic system seen in this video.
@jimhodges34714 жыл бұрын
As the owner of a 500 cad in an 80 El Camino I am loving this. Thank you Richard. Come on Eldelrock, make an RPM air gap
@mafosa95634 жыл бұрын
a good 3D printing co. could make a prototype to use. just to see if it will be worth it. just a thought. larry
@interst8erj9684 жыл бұрын
What did you do for headers?!?
@thelaneman4 жыл бұрын
What gears are you running in the dif?
@jimhodges34714 жыл бұрын
@@thelaneman 3.55 in a ford 8.8
@richardfinney31792 жыл бұрын
You should contact speedmaster engine and component's tell them to make a airgap manifold for the cadi mo I called them and we need more guys badgering them before they will move on it, tell them about roller cams ,distributers,headers, tall valve covers ,if I was gonna build another cadi mo I would offset grind the crank and use big block Chevy rod bearings with a 7,100 long rod , I've used them in big Chryslers motors up to 514 and I've had good HP out of them speedmaster makes some good stuff ,not like the old pro comp stuff the new director of the company was edelbrocks old director this company is doing some great things I've been doing business with them for 30 years the new stuff is way better then pro crap ,
@Cradletothegrave674 жыл бұрын
I run a 507” Cad in our 73 Cutlass bracket car, forged piston, H Beam rods, Cortney’s 76cc Pro Comp iron heads, 2.25/1.90, full roller rocker. Isky .660 / 260 @.050 solid lifter cam with EDM lifters. Bulldog single plane ( the tall one) and a QF 1050 dominator. It will drag a 3700 lbs Olds in 4000 ft DA into the 11.0s at 120. Leaving at 2000, shifting at 5500 all day long. And it does it with a production block, crank, and head castings. It’s fun and something different. “THE OTHER GUYS “ 👍🏻😎
@SurlyMike4 жыл бұрын
I'm loving these Cadillac videos. One of my old auto shop teachers in high school, Mr. Millar, had one set up on and engine test stand with open exhaust and we had used it to learn set engine timing and things like that. Most of us were 15 and that was a little intimidating at the time. None of the other shop teachers really cared to hear that thing fire up so many times a day. I think when I was a senior one of the other classes sneaked in and bolted some mufflers to it. I always loved that engine and when I acquired my 66 impala back in the early 90s I had since dreamed of swapping out the 283 for a Cadillac 500. I was really impressed with the numbers on the previous video with the high compression iron heads, that's something a guy can build on his own without too much trouble I bet.
@SurlyMike4 жыл бұрын
@Peter Britt this was in AZ in late 80s early 90s, my older brother had the same teacher a few years before
@asambi694 жыл бұрын
I'm a sucker for big inch motors so i love this stuff.
@TheDynotuner4 жыл бұрын
Very glad to see detailed testing on the factory mountain motor 500 c.i. Caddy. But due to the super low rpm range I'd Love to see the 750 Dominator used. We found with the destroked Fords that stayed Under 6000 they loved the small throttle blades of the 750 Dominator
@danawilkes61744 жыл бұрын
I have ran many of the Q-Jets and the Performance Series Thermo Quads over the years, and most worked very well. I even ran Willie's Kendig carburetor a few times. I loved the "Spread Bore" idea. Better throttle response and gas mileage...
@timtaylor61474 жыл бұрын
I have a Chevy Qjet from a 67 truck application It uses an APT screw under the primary rods to fine tune the part throttle mix I worked mostly with qjets Easy to tune but a pain if your in a hurry I was the electric Qjet guy at my first dealership job plus all the other emission carbs from 70s and 80s Still have tuning parts hanging around Great carb
@austindoud2734 жыл бұрын
Someone really needs to hook a ras pi to an electric q jet w/ wideband 02 and closed loop that bitch probably be a sick setup
@michaelangelo80014 жыл бұрын
I have a pile of those electric Quadrajets here, and can't figure out what to do with them.
@deanstevenson65274 жыл бұрын
Michael Angelo : Use them as dual Qjets. MCS is great. Everyone understands pulse width modulation on EFi, but not on Feedback Carter Thermoquads and Rochester Quadrajets. Why, why, why?.I.e.a.o.....
@michaelangelo80014 жыл бұрын
@@deanstevenson6527 Oh, I have a SBC M/T cross ram already modified to accept dual Quadrajets. I'd love to put a couple of these on it, but who has time to build the electronics for such a capricious one-off application?
@TheSamcram4 жыл бұрын
I love this series so much because I’ve got a 1970 Cadillac with a 472 big block (the shorter stroke 500) and it’s basically helping me plan out what mods to do to mine to make it a mean machine! Thanks for doing this official dyno series Richard!
@kellyjones8414 жыл бұрын
Great video and info Richard, real world parts and work. Thanks for the quadrajet knowledge, Courtney!
@Allianceoffroad4 жыл бұрын
Edelbrock needs needs to make a Performer RPM package for this motor!!...Aluminum heads...RPM air gap intake....matching cam
@michaelangelo80014 жыл бұрын
Seriously... The heads are the sticking point. The ones available now are just too expensive. It's cheaper to build a stroker BBC.
@danawilkes61744 жыл бұрын
Edelbrock can make Chevrolet 409 heads, and not these!!! That is Edelbrock for you...
@ghostrt16084 жыл бұрын
@@danawilkes6174 ...yeah, u got a point
@biscuitboy36174 жыл бұрын
You can use the Performer RPM Air Gap for a 429/460 Ford on the Caddy. The port spacing and several other dimensions are either the same, or very close. I've seen this before, I think it's 'Cad Company' that makes an intake adapter kit . I've seen a 500 Caddy with a nice polished tunnel ram for the 460 Ford installed on it.
@michaelangelo80014 жыл бұрын
@@biscuitboy3617 The experts tell me that the Fordy intakes don't perform that well when adapted to a Cadillac engine.
@thisisyourcaptainspeaking22594 жыл бұрын
I'm running a Thermoquad on my 455 Olds, took the Holley off and gave it to a stranger I didn't know. I wouldn't hesitate to run a Quadrajet but didn't have one handy at the time and when something runs great I tend to leave it alone.
@Scootermagoo4 жыл бұрын
We discussed this last video, the carbs should be the same powerwise if the a-f is right. The biggest difference is the smaller primaries on the q-jet for drivability. One advantage a holley has is 2 fuel inlets, which is the biggest limitation on a q-jet. Holleys are built as universal racing carbs and q-jets were designed for street driving. If you have never driven both, a well tuned q-jet has better throttle response compared to a holley. the holley can be tuned more for rich lean on paired cylinders and can be made to run better on single plane intakes and so on. If were going to discuss big carbs. The engines only going to pull x amount of air, but with a carb unlike efi the bigger the throttle opening the worse the response is.. So the dominator looks cool might make a little more power but it's gonna run like ass on the street on such a mild combo.
@wesbafguy4 жыл бұрын
Courtney is the man. Please thank him for the info!
@deanstevenson65274 жыл бұрын
Wes Beaman : (and from down in the moonshine haul area of the deap south...New Zealand. Hearse and Hell Pizza territory....much love)
@dannoyes44934 жыл бұрын
Have you ever thought about naming you channel "The Enthusiastically Happy Engine Dyno Guy Who Never Sleeps"? BTW, great, great content.
@richardholdener17274 жыл бұрын
Seems long-but I like it! I sleep between dyno runs
@willieshaw25224 жыл бұрын
I'd run the Q-jet on the dual plane - power is close to the Holley, and just love the Q-jet sound.
@DSRE5354 жыл бұрын
Q JETS are awesome, basically the most adjustable carb ever made and i build a lot of them for performance, i like the drivability
@thefinalroman4 жыл бұрын
It was garbage.
@DSRE5354 жыл бұрын
@@thefinalroman only if you have no clue what you are doing, they make edelbrocks for the simple folk
@thefinalroman4 жыл бұрын
@@DSRE535 even in 2020 the Quadrajunk strikes again kzbin.info/www/bejne/b16woa1qYq1rkMU
@mattrodgers48784 жыл бұрын
thefinalroman maybe you’re just not smart enough to figure out what’s wrong and make it work correctly? How many MILLIONS of Q-Jets were built? They worked very well for something you call garbage.
@thefinalroman4 жыл бұрын
@@mattrodgers4878 U crazy all the quadrabogs are rotting in junkyards where they belong. The cars are begging for a Holley....
@RUBIZEN4 жыл бұрын
"Carbed" it? Damn near killed it!
@BruceLee-xn3nn4 жыл бұрын
Now you got everyone hunting caddie qjets
@liljohn38774 жыл бұрын
If you had center dump headers(Sanderson), I'd love to see those against the long tube headers and stock manifolds. From old reading, it sounds like even junk homemade headers are an improvement over the stock manifolds.
@travisabrahamson50924 жыл бұрын
I would love to see street demon carb . Has nice tiny primaries and giant goggle valve secondaries. I've only run them on sbc so far but very nice street carburetors.
@erenzoscroggins80564 жыл бұрын
Great information Richard... And for those who don't know they're are some Aluminum heads for the Cadilac that been out for years Caddy power going up💪🏾💪🏾💪🏾💪🏻💪🏻💪🏻
@hotrodray68024 жыл бұрын
He is at the Caddy specialty shop. YeeeeeHaaaaaw !!!😎😎😎
@joekingrey14234 жыл бұрын
Love the big Caddy...now it's time for some Boost !!!
@dondotterer244 жыл бұрын
Glad it worked out great for the Q-jet. 74 jetsis a big change using the same primary metering rods. Hope it dont load up at idle.
@timothybayliss66804 жыл бұрын
I know the ls adapter intake test failed to impress, but Ford 385 intake adapters have been a staple for years with these engines. There is also way more intakes in both CJ and standard port sizes available. That's maybe something to think about.
@finnroen23344 жыл бұрын
Dual plane with full divider wall, divided spacer and Dominator would be interesting.
@adampatterson7074 жыл бұрын
How much power can you get from the factory intake manifold? Some 425s have an aluminum open plenum intake manifold. What would 500 do with one of those intake manifolds? On a couple of other things, grew up with Q-jet carbs and we learned how to fix em. I have a Q-jet on a 4.3 in my firewood hauling truck and it works great. Old school turbo mufflers all the way. There is something about the sound of a healthy engine with a set of Thrush turbo mufflers that just warms my soul and puts a smile on my face. We'll never be able to thank you enough for all your hard work and dedication.
@michaelangelo80014 жыл бұрын
The factory intake works a lot better than you would think...
@Bumblebee47884 жыл бұрын
425 manifold runs uphill, I replaced mine with a hogged out carb flange 472 manifold and made more power!
@adampatterson7074 жыл бұрын
@@Bumblebee4788 I have a 425 and the TH400 transmission. Both for $100. I know my 425 has the aluminum single plane intake manifold. I'm hoping to maybe learn a bit to see if anything can be done with a 425. That 425 would smoke the tires in the old coup it came out of.
@ricon.i4744 жыл бұрын
It would be nice to see how a efi carb like the holley sniper would preform
@pjmccoy42164 жыл бұрын
I'm thinking a can in the 235/238 with .580 lift would be a great street can. Allow you to rev out to 5000 but still have all the peak power in your normal driving range say from 2600-4500 would bring many meant smiles per gallon of gas.
@Tegridynews4 жыл бұрын
I'm a Ford guy and I would rather watch that motor be a boat anchor for the Titanic to save it from the iceberg but I'm here watching this video because your cool
@thereluctantgearhead45444 жыл бұрын
Pretty narrow minded huh, that's gotta suck being stuck in that little box. I'm a GM guy, but I like Ford's too.
@garykentner75574 жыл бұрын
I have a 70 nova with a 500 Cadillac I have tried many carbs over the years I settled for a 800 cfm Holley double pumper spread bore it performs best of all for raw brute power the Q jet worked nice for Streetability and fuel economy but that Holley kicks but for full on tire churning performance. My nova runs 11.90 with 3.08 posi I have a Dana 60 locker 4:11 I’m guessing it will run somewhere in the 10 area I have a modified hogged out plenum with a spacer it sings to 6000 max built the motor in 93 and still going strong as ever with no oil consumption still has 55 psi oil pressure more guts than ANY big block I’ve ever built or owned that was naturally aspirated get one you won’t be disappointed the weight is between a SBC and a BBC it’s wide and use an Eldorado rear sump pan have fun
@JohnH.-qp6fb9 ай бұрын
My first time with a Cadillac in my own car. I've built 2 for customers years ago. These things are a brut ! Both were so cheap to build and so dang reliable. Both get 17 mpg on the hiway at 2,200 hilly terrain. Cam, 800 holley, big valves, edelbrock. That's it. Guy's that ride in this thing just start laughing when the pedal goes down. Best engine I've personally ever had.
@baby-sharkgto49024 жыл бұрын
I'm fn LOVING this series
@timecklund76852 жыл бұрын
Good job testing at very low rpm. Useful info.
@michaelangelo80014 жыл бұрын
The Performer is what I use. It's the best street manifold on the market right now. There is also a tunnel ram available though...
@unclesquirrel69514 жыл бұрын
Caddy tech info is always awesome
@scottbeckman48874 жыл бұрын
Great video, can't wait for the Buick
@blueridgemountainprepper21664 ай бұрын
I think I love how yall started pulls way down low, I'm a sucker for big torque way down low
@Martmns4 жыл бұрын
Richard...you said you wished there were other intake manifolds available for the 472-500 Caddy. Actually there are. Before the aftermarket - ie - Edelbrock - had a manifold specifically for the Caddy V8, guys used to adapt intake manifolds designed for the 429-460 Ford. I've never tried it but apparently the width and the port layout of the 429-460 Ford intake manifold is very close to that of the Cadillac and with a bit of machine work can be fairly easily made to fit. Since there are a huge variety of performance manifold designs made for the 429-460 Ford, this opens up a similarly huge number of intake manifold possibilities for the Cadillac. You might want to look into this.
@richardholdener17274 жыл бұрын
thnx-we know about the 460 intakes-its a fair bit of work
@crazyhorseracing61302 жыл бұрын
Those mufflers must flow good... what kind are they?? Thanks for the videos!!
@Bolton1153 жыл бұрын
Great series! Just curious, have you had any experience with the FiTech or Holly four barrel carb bolt on replacement fuel injection units? I'd sure like to see some dyno runs of how those systems work. The RV conversion crowd loves them-they don't leak, they self learn, and guys I've talked to say they no longer have to downshift into second when driving their old GMC motorhomes up I90 towards the Summit. I know that's not a dyno test, but real world, they seem to generate a lot more tractable, streetable power versus a carb. I haven't run any of these EFI systems yet, either, so that's why I'd like to see some dyno test action. Either way, thanks for the Caddy engine love!
@richardholdener17273 жыл бұрын
A 4-BARREL THROTTLE BODY WON'T USUALLY ADD POWER COMPARED TO A CARB
@Bolton1153 жыл бұрын
@@richardholdener1727 Having extensively tuned the old fashioned way-jets, springs, needles, distributor advance weights and springs-was thinking that entering the modern age of computer controls might get more power out of less time futzing.
@Steinmetz14 жыл бұрын
I have a 500 bored .080 over. .650 lift roller cam roller rockers, ported aluminum small chamber heads with sniper efi. I'd love to see something similar to my build. I have the single plane because it looks cool but might switch back to the dual plane maybe ported
@01fxdlse4 жыл бұрын
Learned a whole bunch about cadi’s thanks!
@dangerousfreedom49654 жыл бұрын
So it likes the duel plane more, do to the motors low RPM?
@danieldimitri61334 жыл бұрын
All of the quadrajet literature I've ever read says they don't take fuel pressure well. The needle and seat area is a big factor and perhaps the smaller seats do take good pressure but it's generally recommended to use a bigger (but not over sized) seat with low pressure. There are different floats with longer or shorter fulcrums etc so you can experiment for the best combo if you're racing superstock or something. The ho 305 motors tended to have pretty good secondary metering rods and there are probably a hundred mods you can do. The type of carb you choose shouldn't make a difference on the Dyno. On the street might be a different story but as long as you don't go too big with the holley it should be fine.
@glennmanchester56962 жыл бұрын
what ?? every q jet i ever ran liked more pressure than any Holley almost ten psi w out over powering the needle and seat easily and you want that little bit of higher pressure because of the small fuel bowl it has to keep up w fuel use under wot I was surprised to see the q jet take all that over 5 psi like the Holleys could handle it ran great w the stock fuel pump from a tbi and a fuel pressure regulator w return line never a hiccup not once did it ever starve and this was a big cubic inch thirsty motor a 455 pontiac and the 800 cfm carb it came with in 1978 in a 1990 chevy obs pickup truck it was a blast w the turbo 400 and a shift kit in it the carrier bearings didnt care so much for the shift kit lol nor did the u joints but they settled in when I replaced all of it at once even had a limited slip carrier installed w a 373 :1 ratio for a 4500 lb truck it was pretty fun and tires were sent to tire hell on the reg lol 2nd gear sitting still spinning at 90 mph burnouts were well smokey Imao
@glennmanchester56962 жыл бұрын
oops it says 455 it was a 400 trans am motor
@brocluno014 жыл бұрын
I think that is near a perfect motor for a Berkeley JG Jet Drive with an A cut impeller in a family boat. Beefy, sweet motor with front mount distributor and big TQ with max power at 5,300. Prolly a better choice than an Olds or a BBC for a family boat with wet log manifolds since it does not seem to be terribly exhaust sensitive. It should have no trouble hitting top RPM with a generic pump set up that you find in many older Jet Boats available on CL with a bad motor. Question is will it bolt up to Olds "bell housing" and accessories, and existing mounting brackets ...
@Jeffsa124 жыл бұрын
will it bolt up to Olds "bell housing" Yes for the bell housing and no for everything else. May be able use BBC water manifolds with home built adapters. For the belt driven accessories, I'd start with the factory Caddy brackets plus some fab work.
@shanehaws38284 жыл бұрын
I had a 472 or 500 that was stock with manifold and single exhaust that had restrictor in the begaining of the pipe at the end of the manifolds
@VORTECPRO4 жыл бұрын
Learned something about the Cad Q-Jet. Richard, you need to explain to the people when this engine makes 560 corrected HP its really about 420-430 observed or in the room HP in a 24.50 baro, I know you don't want to confuse people but it needs to be done.
@hotrodray68024 жыл бұрын
All dynos are corrected to sea level power..... Its industry standard
@deanstevenson65274 жыл бұрын
VORTECPRO : He continually and carefully explains this. Especially to Ford guys ( we get Buck shot hurt when a GM or worse, Mopar, or worse worse, an AMC handz it to us on a dyno. Any thing with a D in it. Or an M. Or a C....ouch. This snow flake is Melt Ting....)
@deanstevenson65274 жыл бұрын
VORTECPRO : Welcome Mark. A shout out to you....your head porting work and Gross Reported SF 901 hp is a credit to your handiwork and total commitment to honesty and transparency in reporting.The key here is you and Richard, Westech and the Courtneys kind of SAE Gross dyno testing and head porting or other mods is the Only Game in Town. As Richard will attest, Chassis dynos with a set loss converted back "should" be a better system of flywheel net power determination, but engine, tire and trans heat soak and counterweight losses are not constant or linear, yet the 300 or 600 rev per second speed factor is universal and SAE Gross SuperFlow 901 and 902's are repeatable to the horsepower using the aggreed SAE Gross Correction factors.. Gross SAE hp Dyno testing is a great thing, but the certified DIN or SAE J spec net is not repeatable unless a full exhaust with the sterner humidity, altitude, temperature and barrometer and full underhood air temperature, heat stove and air flow restrictions are included. Thats a huge amount of work. You have to drop the drive shafts or tires or put on a mock 100% factory engine bay and wind tunnel it with similated air flow and full exhaust. And do uncertainty and repeatabilty tests. Its all or nothing. For your info, The idealised shift between the two SAE Gross and Cerfified SAE Net readings is 1.14 to 1.16, historically, but on engines with cool air indiction or CAI packages or using dropped header pipes, it can be less or more. Specific to 5 liter Trans Am and SCCA and 7 liter Drag pack cars in the late sixties, and Fords in particular, The Peak power RPMs were also fudged so a dual quad non competition G code 289 Tunnel Port made 390 hp gross at 6000 rpm but was rated at just 240 hp gross at 4600rpm "down the curve". In a similar way, a Cool Air Induction package could turn a Cobra jet or Super Cobra Jet 429 into 430 hp gross but was rated at 370 or 375 down the curve. Cam Benty at Popular Hot Rodding in late 82 then discussed this return to fudging SAE net figures when the 2bbl Mustang 5.0 GT and 82 F bodies came out and did flat 16s or less with 157 to 180 hp net engines. engines.Gross hp Factory fudging and the huge logistical problems with replicating the certified SAE Net figures mean the idealised 1.141 to 1.161 difference between SAE Gross and SAE net is variable. Down here, a 300 hp Cleveland 351 US M code we used from 1970 to 1973 could be up to 390 hp gross without the 6150 rpm rev limiter, and at 6500 rpm or 340 to 350 hp net at 6150 rpm, depending on Shaker intake package and rev limiter. All iron intake engines, no EGR, but 3310 Holley 4bbl and similar K code 310 degree or 505 lift 300 degree cam. So your 1.30 to 1.33 factor would have ment Ford Australias Gross Rating would have had to have been 442 to 520 hp. This is wrong. The big stick SAE Gross to SAE net factors are just 1.141 to 1.16. A 1969 Pinto made 112 hp SAE gross but 98 hp DIN net on the Ford West German Cologne dyno. My 1958 Vauxhall Velox 138 cube six with 7.8:1 compression made 82.5 hp SAE gross, but just 72 hp SAE net. Summary...the Gross to Net figures are a lot less than a third off..Our Australian 14.4 second 265 Hemi Charger E49s with triple DCOE 45 Webers were factory rated at 306 hp at 5300 rpm SAE Gross, but made 295 hp SAE net at 5600 rpm on Leo Leonards Timaru New Zealand truck dyno. 1.04 difference. And thats how the Gross to Net conversion goes on Muscle Car engines or 2 liter Pinto sh!÷ boxes. A final summary. The factory Dearborn 155 hp SAE Gross 250 1bbl six made 102 hp SAE net on the Geelong Ford Australia dyno. 1.52 factor loss. So it varies a lot. I'd say use the generic SAE Gross to Net conversion. The US factory ratings from 1968 to 1971...they were accurate, but on some engines, adding a super restrictive tin hat cleaner and 1-7/8 inch exhaust system really kills power,exactly that much. That's where the 1971 verses 1972 1.3 to 1.33 factor drop came from, often 1.52 on the 250 and 302's. Its not accurate. Lastly, the net figures on a hydraulic cammed 11:1 1971 and 9.4:1 1972 Euro spec left over US Vin M code de Tomaso engines was 330 DIN net at 5600 rpm and 310 hp DIN net at 5400 rpm, but the same engine in the 1970 US 351 4V 1971 Ford Falcon GT made just 300 hp gross in Australia and the USA. The correction Factor was then 0.91 at worst, or 1.52. And that means Im not comfortable with a 1.3 or 1.33 SAE Gross to SAE net correction. 489 hp SAE Gross is generally 425 hp SAE net +/- 4 hp net. But not always. Richard has discussed this at length in one of his videos. It depends on all those ancillaries. This is Not Engine dyno Verses Chassis dyno or Flywheel HP vs Rear Wheel horsepower EG 1 @ kzbin.info/www/bejne/sGOplaeIl55nntk but Cold Air Intake, Fan, Accessories. What are they worth? kzbin.info/www/bejne/r3mrfXd6p66Wm5Y A 400 hp net Parnelli Jones Boss 5.0 gives 480 hp SAE Gross with the factory accessory drive and headers with cats on a SuperFlow 902, a factor of 1.20. So theres a huge issue with SAE net to SAE Gross hp factors.Taking the acessories off, it will easily push over the 500 hp level.
@RandomLifeTimothy4 жыл бұрын
Wow. That motor is a beast
@JohnClutch14 жыл бұрын
Also, whats the volume ratio between the headers and the collectors before the mufflers? I bet 1.25x collector volume would be the hot ticket.
@LunarOutlawsGarage4 жыл бұрын
Keep up the great work. 🤘
@benwingo66754 жыл бұрын
Oh yeah that alitude adjustment thing on the Q-jet it's on other carberator to it was used as part of emissions controlling when it was at closed trottle. Yes the Q-jet circuitry is well less say one to ponder. It worked but that's it. Nothing to write home about.
@johnb74304 жыл бұрын
Love the info. The monster caddy has come to life but, Come on now... tell us how much VACUUM and BSFC. These big azz motors are street driven and mostly in bigger cars. Give out how well the combos will work on the street.
@puffkendrick68504 жыл бұрын
That was the one of the reason most 500s came with a hydro boost brake system
@Bolton1153 жыл бұрын
@@puffkendrick6850 The reason Eldos came with Hydroboost has nothing to do with the ample idle vacuum made by those old 1970s cams, and everything to do with competition-Rolls Royce had a camshaft driven, dual circuit brake pump system like on an aircraft. Cadillac, as the DeWar 'Standard of the World' trophy recipient, had to come correct in this area. I've worked on the Rolls Royces back in the day.. quite an interesting system, each wheel had two physically separate calipers because there were two physically separate brake systems. One driven off each end of the camshaft of that engine which, coincidentally, Rolls Royce licensed the design of it from Cadillac. Hydroboost was a better, more reliable system.
@trailerparkcryptoking52133 ай бұрын
Stock 472’s have 22” vacuum....
@jasonhooey56774 жыл бұрын
Single plane intakes time after time just dont "work" on street motors. And a good dual plane will work in higher rpm anyways
@adamn35334 жыл бұрын
Love all the different parts you're throwing at this motor! Why no pulls from down low? Seeing pulls from 2k even high as 2500, what about off idle pulls?
@scotthatch46534 жыл бұрын
It's really hard to fully load a motor on the Dyno that low ... And it's very hard on the motor itself would kinda like it to live through the test ... Funny thing at idle we add load but not throttle to get some heat ..it shows 60 ft lbs with no throttle at all
@richardholdener17274 жыл бұрын
off idle pulls at WOT?
@adamn35334 жыл бұрын
@@richardholdener1727 Sure, kinda like bogging it down with standard trans.
@adamn35334 жыл бұрын
@DropDstar I have 500 cad in my truck... full throttle below 2000rpm will still smoke the tires
@adamn35334 жыл бұрын
@DropDstar I'm just saying it's making more than enough torque below 2k to churn all 4 of my rear tires. I'd like to see that number. I've never had any other engine pull like my 500.
@Steinmetz14 жыл бұрын
Thank you Richard
@kimmorrison91694 жыл бұрын
love this test but 12 to 1 compression would be a deal killer.
@jamest.50014 жыл бұрын
Yeah, a performer rpm airgap would be nice! I never seen one for caddy!
@michaelangelo80014 жыл бұрын
Why would a "caddy" need an intake manifold?
@dangerousfreedom49654 жыл бұрын
Please show the before and after power numbers together.
@azlandpilotcar44504 жыл бұрын
Could someone get the best of exhaust performance by having mufflers with no constriction in the exhaust pipe? Maybe a Y pipe with four mufflers for the configuration in this engine? The Freiburger/Dulcich exhaust tests on Enginemasters seemed to suggest to me that it might just work...
@dalegroves19184 жыл бұрын
I'm thinking you should compare a 800 cfm holley to keep the comparison equal.
@kevinjohnson93724 жыл бұрын
My opinion is the dual plane worked and best sp grind the numbers and markings off and pant it blue like the rest of the engine then install that engine in a caddy with a stockish air cleaner that has been modified for dual snorkels and send it
@michaelblacktree4 жыл бұрын
An altitude compensating carb? Neato!
@angelovasilikos79804 жыл бұрын
Very impressive this motor is such a monster! I would definitely use the dual plane but I would also like to see this thing love to at least 6500. Is that going be a next test?
@hotrodray68024 жыл бұрын
Requires rods etc. BOOM
@scottb75594 жыл бұрын
How about a four hole spacer on that single plane intake?
@asjmpickle4 жыл бұрын
You're making me want a 500 caddy over a small block Chevy
@blaggironheart99194 жыл бұрын
i love adding spacers.. but they usually have nitrous lines attached
@V6turbo4 жыл бұрын
Its really starting to sound nasty too. Love ya work Richard.
@JohnClutch14 жыл бұрын
I dont know the specs on the heads. And Im pretty sure your choice of cams was based on them. So with that, I dont think the motor has enough cam/heads for a dominator. The Quad and 4150 seems to be plenty and cant imagine that bottom end being spun any harder than it already is.
@iiNgONYaMa2 жыл бұрын
Do you have a link to the vacuum diagram for the 500 q jet?
@smileychavez80934 жыл бұрын
Hey Courtney Smiley here in Belen New Mexico you have to let me use that engine for my black 70 Deville lol Courtney has been to King Cadillacs since I was a kid
@richardholdener17274 жыл бұрын
Courtney and the gang know how their Caddys
@jamesreeder53162 жыл бұрын
I have used spacers and I think they do increase power. But aren't you using a bigger holley I thought you said earlier that it was a 950? And if so it's not quite even ad your using a Qjet 800. I may be wrong.
@jordanwiley45824 жыл бұрын
Quadrajet is hard to beat upto about 500hp or on a daily vehicle. There are literally 1000s of combinations of jets, metering rods (primary AND secondary), as well as secondary hangars (how far in the secondary "jets" the rods hang, secondary jets are just a hole, they aren't actual jets) so its more difficult to get just perfect. But, my personal theory still holds. A qjet can and will run with the best of em if you put the time in.
@thefinalroman4 жыл бұрын
it's garbage kzbin.info/www/bejne/b16woa1qYq1rkMU
@thefinalroman4 жыл бұрын
@DropDstar The quadrabog is legendary as a mess that leaves u stranded with sub 10mpg when it does work. No wonder the quadrajunk died along with the 305 dog motor...
@jordanwiley45824 жыл бұрын
He's probably just mad because a well tuned qjet 305 whooped his Holley topped 355 lol
@jordanwiley45824 жыл бұрын
And that link you posted was on a REVIVAL 72 CUTLASS THAT SAT FOR 33 YEARS WITH OLD GAS. He lives in my state, he drove that thing 300 miles home and has been daily driving it for a month. Cant do that with a holly or edelbroke carb. Hasn't even been rebuilt.
@thefinalroman4 жыл бұрын
@@jordanwiley4582 Open mouth insert foot. It died..... kzbin.info/www/bejne/l3m7n36vmNh9eJo
@Joeleesander4 жыл бұрын
Aren't there adapters that exist to run 429/460 Ford intake manifolds? That would open up the intake game a ton, no?
@richardholdener17274 жыл бұрын
yes-but they are not perfect
@Joeleesander4 жыл бұрын
Richard I guess maybe weird port mismatches?
@interst8erj9684 жыл бұрын
Really would like to se a blow through Qjet carb for the next test session.
@richardholdener17274 жыл бұрын
never tried that
@interst8erj9684 жыл бұрын
@@richardholdener1727 I came across this old Hot Rod article about this Pontiac with an old Rajay turbo and Qjet. Seemed like a big pain the ass to make it work. I love the 4150s I've had/have but Im always rooting for the Qjets.
@calvinevans83054 жыл бұрын
Cad 500 with tunnel ram or belt driven intake manifold.
@hotrodray68024 жыл бұрын
Hoping to see that belt driven intake !! 😱😱
@idletime4 жыл бұрын
Wahoo, thanks Richard great video as always 😇 . What did you get for stock power numbers @ elevation before you started making changes? 🤔
@hotrodray68024 жыл бұрын
Previous video.
@richardholdener17274 жыл бұрын
312 and 500 lb-ft-you better be watching ALL the cad vids!
@hackfabrication1394 жыл бұрын
Can't wait until you add..... BOOST!!!!
@erickleven17124 жыл бұрын
Here's something, and this Caddy might be a great engine for it: Collector length extensions and their effect on the torque curve. You've done the intake, now the exhaust?
@richardholdener17274 жыл бұрын
we did that test with the mufflers
@erickleven17124 жыл бұрын
@@richardholdener1727 But even more so, get cartoonish with the lengths! Thanks, Boss! Keep it up!
@thelaneman4 жыл бұрын
My 500 cad has the edelbrock with a 1' 4 hole spacer and a q jet.
@dondotterer244 жыл бұрын
To get real tricky with the exhaust you can make what I nickname swirl chambers like David wizard has used in his testing.
@glennmanchester56962 жыл бұрын
vizard
@greggc80884 жыл бұрын
I think a torker intake would do the trick. The volume isn't as high, but it would flow better and not need the spacer. Dual plane isn't the reason the performer did better. In my opinion, the other intake had too much volume. Especially for those heads.
@richardholdener17274 жыл бұрын
its not volume-its design
@greggc80884 жыл бұрын
@@richardholdener1727 Idea-Give us a true same engine dyno run with both single and dual plane. And not a huge Victor single plane but something like a Torker or Torker II. I think you would be surprised. And you probably already know that as you seem to run a lot of numbers. I admire that about you.
@halldorra4 жыл бұрын
How about a divider plate in the single plane?
@pancudowny4 жыл бұрын
I think it's time to try self-learning TBI on it... because Lord-knows the factory put EFI on the 500 near the end! ;)
@GroovesAndLands4 жыл бұрын
11:39 those look like aluminum heads!! Results forthcoming, I assume!
@richardholdener17274 жыл бұрын
yep-on their now
@theupscriber654 жыл бұрын
How about the Dominator on the dual plane with a spacer?
@richardholdener17274 жыл бұрын
we might try that
@derekdelsonno8744 ай бұрын
Have you done a 455 Oldsmobile yet ? I wish you would
@richardholdener17274 ай бұрын
have not
@make-it-work4u4 жыл бұрын
Do they have tunnel rams for Cadillac 500?
@ARK8420014 жыл бұрын
Spacer on the single plane?
@american48904 жыл бұрын
My comment is that when you went to single plain the hp is catching up to the torque 🤟🤙👍🤝🙏 peace
@the-dullahan4 жыл бұрын
"Hey guys, I'm here with Courtney, he's going to tell you what's different about the Cadillac QuadeaJet. But for fun, I'm going to run some dental drills in the background whenever he tries to talk."
@johanwallqvist6464 жыл бұрын
Those Caddyshop people really know there stuff!!!
@davidreed60704 жыл бұрын
Great job, what do you think about a resonator chamber before the mufflers, should be the best of both worlds.
@hotrodray68024 жыл бұрын
VIZARD exhaust system.
@davidreed60704 жыл бұрын
@@hotrodray6802 yeah, nascar has been doing it for years,.it seems the chamber equalizes the pulse, then the mufflers don't matter.
@davidreed60704 жыл бұрын
@DropDstar the chamber works from mid rpm on up, I used to build big block Chevy pickup trucks, as soon as the pulses get backed up in an ex system the chamber smooths them out and the mufflers see a steady flow,if you use a DYNO you will see the gains but right, most chassis won't accept it, no room. Later in life I built novas and just used an x pipe or a cross over.
@davidreed60704 жыл бұрын
@DropDstar I have been fortunate enough to have access to a DYNO and I would take that extra bit of power be it at 3500 or 7500. The most gain I have seen is collector extensions
@rodneybynum81044 жыл бұрын
Did you pick a winner for the H.P. guess ?
@ryanaxberg92634 жыл бұрын
OOH, Richard your almost at 100,000 subscribers. Pretty cool
@richardholdener17274 жыл бұрын
thnx for the support
@jeffreydavis4094 жыл бұрын
How about EFI ?
@aclive20222 жыл бұрын
have you ever put a edlebrock 1406 on the 472 or 500?
@richardholdener17272 жыл бұрын
i have not
@s2upid4 жыл бұрын
I didn't see a single pair of faded white new balances in this video series. I'm not sure if the carb results can be trusted because of that.
@genemauguin86114 жыл бұрын
To the guy saying the Holley 4010/4011 series are Carter based carbs. They are actually based on Ford 4100 4bbl design. Early models had poor primary annular discharge boosters.