OE SBC 4 brl intake mods for a whopping 26 HP increase!

[@robertwest3093]

I modified an aluminum SBC Quadrajet intake manifold as per the instructions in your carburetor and intake manifold book. It was a killer daily driver manifold! Noticeably more off idle and mid range torque than any other dual plane manifold I had ever tried and it made more max HP than the ZZ4 dual plane intake it replaced.

[@isaacandruthruss90]

I live in NZ so I didn't see this video until the morning. I was lying in bed with my wife and we were chatting away. I saw there was a new David vizard video so I started watching it. My wife said, what a lovely voice to wake up to. Such a gentle and soothing voice to wake up too. Thank you DV, I might make this a new morning routine.

[@CraigLandsberg-lk1ep]

I do that every morning as well!😅😅 Great wake up call lol

[@timothyarnott3584]

Hey David, Tim here, now THATS a super cool, vid on mods that are worthwhile......ANY intake i purchase, i will now chk the radius from plenum to runner.....i kinda felt like that cud be huge, as we dont want charge shear, but YOU validated my hunch, and i'm SO thankful i've been a sub'r for at least 2 years now (i believe).... Quick story, i have a 462 inch Poncho, ported Kauffman heads, Edelbrock Torquer II, i ran a 2" spacer for years, one night at the track, i just experimented with spacer sizes........car sliwed with every other spacer i tried, untill i went back to the 2" open, BOOM ET, and mph, were back to where i started......each engine needs plenum volume, appropriate for the combo......THIS vid, validated ALL my effort, and thought.....yep, appropriate spacer size, and nice radius from plenum to runner!!!....THANK YOU SIR!!!!.....peace to you and yours, and PLEASE dont stop, untill the Lord says so......BOY i dug this vid!!

[@joe-hp4nk]

God only knows what lurks within.

[@PaulThomas-qo9vy]

Thank you for all the knowledge you share! It seems one budget bound hot rodder could use the same logical thought process & modify most any wet manifold design for more flow efficiency! Great stuff Mr Vizard.

[@klaver3913]

Would LOVE to hear more about cleaning up the runners by acid dipping (at 14:20). Fantastic job, as always. Thanks.

[@martinsuter3531]

You sir a genius! Thank you for posting all this wonderful information! Almost everything else on net or in the magazines is solely propaganda on how to spend money, rather than using logic, thought and elbow grease, in support of aftermarket parts venders and manufactures!👍👍👍

[@kevinclancy.]

Thank you Mr Vizard! Great stuff. FYI I've played with the Holley spread bore carbs for high performance, and just be aware some of them had "reverse idle" circuits, meaning the mixture screws actually metered air (not fuel) and the idle discharge ports and transfer slots are quite small (I think only 0.027" if I remember my measurement). Of course this can all be modified, just wanted to mention it as it can be difficult to get these carbs to idle with a cam that has decent amount of overlap.

[@autonomous_collective]

I dont think I'll ever use any other Carb except the AED's. Simply the best vac sec carbs ever.

[@tommycook9620]

ALWAYS GREAT CONTENT 👍

[@jmc6940]

Just about finished with the budget build book you mentioned. Already have the porting book ready in the chamber 👍

[@crazyDIYguy]

We got 25hp and 37ft lbs of torque out of a Subaru ej20 just by polishing down the inside of the aluminum intake manifold runners and plenum sanding down the factory casting marks and the rough surface in general. I used a steel cable, drill and sandpaper from a cut up sanding belt. I think skin friction, drag, and fluid dynamics in air passages aren't given as much credit as they deserve in the performance culture. Fascinating.💯👌

[@mikef-gi2dg]

I have that book DV and many others. I did my first modification to the same type of intake about 30 years, ago, but not quite as extensive as he did here. The engines were basically stock 307's or 305's and a 250 hp 68 327, of very high mileage. No optimized cam, exhaust, carb, ignition, to speak of. I have a bunch of aftermarket intakes, but I am currently modifying an iron and aluminum oem intake just to see what I can get out of a updated ( ULTRA STEALTH )combination as seen here. It worked way back when, it should work even better today. and look like a boat anchor candidate. I got the stealth idea from DV, way back when.

[@jonfrost7996]

Your creative mind is nothing less than phenomenal David. I wish I could absorb two-thirds of what you put out there so far. Your analytical mind devours misinformation and passes along insight. Thank you

[@rlprgp62]

Great as always Sir. Thank you so much for the comment and the forward thinking.

[@gregorymarch91]

Love the stealth/smarts vs.$$$ vids. Great job!! Much thanks.

[@chevyrc3623]

That is so amazing to me you take what's there you modify it to the optimal and gain some power that is awesome

[@theblackhand6485]

@Mr. Vizard and Andy: Opening up a intake manifold/-channel actually helps. But it is 'dangerous' too. To much you will loose velocity. And then the length of the channel, thus the thickness of a spacer plays a part too. One of them is gasoline back firing into the intake channeling. May be Mr. Vizard or Andy can explain the details (?).

[@paulmryglod4802]

On performance motors, the older stock heads and stock manifolds have a high threshold for how much material can be removed before loss of velocity becomes an issue, vs increased overall flow. On aftermarket intakes with already improved runners of larger diameter, killing velocity is much easier to do.

[@dondotterer24]

Do you have any pictures or diagrams of the super sucker? How does the string act I areas where you need to take out metal? Thanks for the great videos!

[@v.e.7236]

Sorry for your loss. 19 is way too young to die.

[@davidshellock1588]

Great stuff. I have waited for this one, having read the articles in DV's books and watched similar efforts in Charlies excellent videos.

[@servediocylinderheads]

Very nice to read, Thanks!

[@gordowg1wg145]

You can also buy "cast iron" paint if you're running alloy heads, or block, for some reason, for the CI look - especially if there's also a few bits of GM paint dabbed on it, and some reddish-brown paint to look like some rusty bits. Depending on the chassis, if the engine uses the "Ram's Horn" exhaust manifolds, you can still buy the 2½" outlet "Corvette" versions to replace the usual 2" ones. You can also gain a bit, if you don't live in cold climes where you need the heating for fuel vapourisation, by blocking the exhaust cross-over heat risers on the intake and, potentially, using some thermal barrier paint on the inderside to reduce heat transfer there.

[@cam3002]

Another great video by DV and team. On the HP/Torque graph you were showing towards the end, seems like torque fell off quickly at the higher RPM range. Was that valve control issues, nature of the cam grind, other? Please keep them coming.

[@Thumper68]

Looks like valve float probably that’s stockish rpm

[@bcbloc02]

Love these tips! I just dynoed my daily driver diesel at 433hp and 1028ft-lb torque at the tires. I need to check it but think it migh finally be over that 20mpg mark average. 😊

[@TheVenom8343]

Hot damn, that's awesome!! What diesel are you running?

[@bcbloc02]

@@TheVenom8343 It is a first gen Dodge Cummins diesel 5spd. It is the first truck up in this video from the event.kzbin.info/www/bejne/pmWuq6dvf9-YmtE

[@TheVenom8343]

@@bcbloc02 Nice!!

[@echadmiyodea]

I wish you would take an opportunity to explain the results further, about the flow capacity of the cylinder heads in relation to the intake manifold, and how the intake gained around 100 CFM on the bench, which only translated to around 11 horsepower in the initial testing.

[@nicolasdeleon2819]

Your videos and writing are always fascinating. Though it seems to be implied, for clarification, was the test 350 using a stock 186 style casting cylinder head?

[@---sp5go]

Mr. Vizard do you have online training videos I can purchase? Do you have training seminars? You provide excellent content for your viewers!! Thank You Mr. Vizard for your time.

[@MVPisME383]

Thank you Mr David

[@lachlanbrown409]

Listening and learning - hoping to put the knowledge into action and make my Barra NA with a 6 speed ZF get up and go...without a turbo.

[@JaapGrootveld]

Hi David, Tanks for your video,s. I live in Europe , so it is not possible to follow your courses. But I heard you talk about a cheap DIY flow bench. I love to build one. Is it perhaps an idea to sell plans via a web site or some other way? Best regards, Jaap.

[@flinch622]

Odd request on books: should you get into new printing runs, could a blank page be inserted after each chapter fpr us to take notes?

[@jamest.5001]

I heard talk of using powdered iron, and really thick paint on aluminum heads to sneak through tech at a racetrack. The intake also, don't know if it was done or just talked about, seems like a epoxy mixed heavily with iron powder could be brushed on, maybe given texture with sand paper when setting, could possibly work, the rules were any iron head and iron intake, stock stroke upto 357-360cid or something, the class we were in we could run aluminum intakes, I wanted to build a light weight stroker either383 or 427,with long rods, (long as possible with a 9" deck,) and a set of dart heads, maybe vortec heads,( this was over 20 years ago) I wanted to build this as a cheater, but I was also thinking, with a 6.20:1 gear, and and about 34" tires about 14" wide, and 15x14" rims , I thought they were 10" until I compared them to a 10" rim, and tried to use a 4way lug wrench! Haha, it was about 4" too short! Anyway I was kinda thinking 374-377 use a 400 block and a offset ground 350 crank get closer to 3.40" stroke, and use 6.125" small journal rods. With the piston out the hole about .020" , the 10:1 355 wanted to rev higher than the just shy of 7k it was just not enough power, or time, fuel was not an issue, they sold two grades regular 104 octane, and super, guessing it was 110 or so. we having compression in the 10's, ran roughly 50/50 104 and 93,I figured it was 98-100 +/-, Anyway a 370's cid should spin up faster, especially with a light piston rods and crank, the flywheel was as light as you could get a stock unit, the pressure plate could used a bit of work, anyway, with 370' something cid, and about 13:1-14:1 and 2.05" / 1.60" valves, and 1.75" headers, and 750 Holley carb, it should do better out of the turns, we didn't shift, with 6.20 gears, we just used the transmission for reverse! 1st gear was geared like a clock, it did maybe 5-7 mph in first gear, take off in high gear, was just a slight ride on the clutch, and there you go, it was a short dirt track, and we didn't drop under 4000+4700 +/- when under green. And I believe if the engine could hit 7k maybe 7100rpm I could been in the lead much easier, the carb had a dead spot we never got out of it, it run great on the street, just a second of sputter when at full throttle as the engine is revving, it was a single pump too small Holley I changed jets, cleaned it up, adjusted the needle and seats, adjust the pump, only made idle Rich, and move the sputter to higher rpm, it was a vacuum secondary, with a screw to get mechanical secondary, the sputter was about 50% opening of the secondaries, with the gears the tach basically moved with the throttle pedal! We ran points ignition, we even went through all that, . It would turn about 7600, before either points or valve float, with the solid 30/30 cam , even tried . 016"/.018 I think it ran crappy, the heads were 250 HP 350 heads,1.94"/1.50" we were on a budget, i think just a new 750 double pump Holley would have us in the mid to front, however, we were taken out, a car in front of me hit the brake on the green flag I drive straight under it, full throttle! Got sprayed with hot water, only slightly burned all over, fixed that, and a car spun out in turn 1-2, t-boned it, taking out another radiator! The first wreck the bumper was about 12" from my A pillars, his bumper, my a pillars, bent my air filter! 😆, Sorry to ramble on

[@randylee7488]

The engine wizard!

[@blueyhis.zarsoff1147]

If you could fabricate a v8 manifold but had to follow a class rule of 4 venturis, what would it look like? Would the firing order effect the design? Would it be different for low end street versus a drag race engine?

[@79beans347]

Good interesting , advice. I gain something from every video . These videos are loaded with quality tips and tricks. Keep them coming ? Are you going to have some cheap sbf heads up forsale next Saturday?

[@DavidVizard]

SBF heads - yes but not this SAT. but next.

[@79beans347]

@@DavidVizard ok that is perfect , that is the day after I get paid so I will have some extra funds for them. Thanks for the "HEADS UP" 😅

[@79beans347]

@@DavidVizard I wish there was a way I could buy them outright cause Im afraid Im gonna miss out on a great deal due to my slow typing skills 😄 Im gonna do all I can do to be first in line cause I really need a good pair for my 347 . I appreciate you giving all of us a chance to buy this stuff and it would be really neat if I could own a pair from such a legand as yourself.

[@russelljackson7034]

Right on

[@____MC____]

Are there diminishing returns on going taller on a open spacer on a dual plane? I got a dual plane ready to go on a 383 and i got a 2" wilson taper spacer A 1 1/2" open wilson spacer And a 1/2" shear plate with a 1"open taper laying around.

[@mikebrooka9395]

I have that original I think it was second edition of the budget small-block book that you wrote and it is still one of my references when I'm scratching my head everything you talked about in that book works with anything that sucks packs Burns and blows and just like all your books same said if it sucks pack Burns and blows you got it pretty much spot-on thank you for giving me a little Helping Hand

[@edwardkurek5355]

Haven’t heard about the 318 for quite awhile!

[@WildDisaster]

He talked about it in his last vid. Tbh, no one will ever duplicate it bc it's not only labor intensive, but skill dependent. And it's an anchor otherwise.

[@DavidVizard]

lets not overlook that as I am recuperating from my throat surgery I can only do video's that are already in the can and require no physical labor!

[@DavidVizard]

@@WildDisaster Not so - anyone with just average dexterity can copy this from the video and it can be done in less than a day!

[@rapidride2]

David, if you have any RHS/Engine quest 320cc iron big block heads ive been looking for a set. I know you were working on a set a few years ago.

[@DavidVizard]

sorry - I wish the answer was yes as it is all good stuff. Keep looking as it will probably worth your while.

[@shotsrodder]

Very interesting 🤔

[@fmanion24]

Question. I have a gmpp lt1 dual plan intake, I was wondering if it would be advantageous to cut the divider in the plenum, as they do in the Edelbrock dual plan intakes. Thanks.

[@bobwhite4344]

very interesting vid.

[@ericneilson1198]

Need to Rsquare Rochester 2bbl to a 4bbl keeping the same intake manifold.

[@kennethcohagen3539]

Holley 4360. It’s rated at 450 CFM.

[@nicholasagnew2792]

So why does the high plenum flow more than the low plenum?

[@omarmuniz552]

I have a 1999 sbc 350 880 roller block 470 lift Camshaft lsa 110 231 duration, 1094 heads gasket .015 with 340292 turbo heads they are mill 58 cc chamber flowing numbers 280 CFM, Edelbrock 7501 air gap intake manifold 650 CFM proform mechanical double pumper... I was hoping to get 350 hp, what can you tell me about this combination?

[@mikebrooka9395]

Odd question for you do you favor or disfavor propane why both ways

[@renwickconolly2839]

I LOVE ME SOME DAVID VIZARD WIZARDRY!😎🤓

[@blindabinda1234]

Right. I can't get enough of visard, Andy, and Ben Alamedas channels.

[@williamherring5441]

DV; Thanks! v/r wh

[@MichaelMatt-ts2mv]

do you have any recomadations for a 406 sbc

[@jamesroberts807]

Could we get an update on the 318 power house???😅

[@DavidVizard]

Yes!

[@autonomous_collective]

DSS?

[@jeffwooton7138]

Love this. If only my tech man would allow it. Dirt tracks have gone away from allowing "at home" mods. Such a shame. Penalizing the ones who research and put in the work.

[@pmd7771969]

Just force feed the f er