Dual or single carb intake?
 

I am building a stroker 462 with aluminum heads for a gasser I am building for street strip use. I was wondering what intakes you guys use? Should I go with a dual carb or single carb setup? What works better?

I've run a victor with a 1050 dom and a wensler with two 4150 carbs
Both seam to be about the same in my world. Others might chime in
and give there results too. The two-four motor was a 440 and the
dominater motor was a 462. I gota say the two 4 motor is impressive.

GT

Was this on the same engine, just different intakes? Or was this two separate engines? If so, what was the differences between them beside intake and carbs

Gasser? Run a bathtub intake, it’ll look awesome!

OFFYL Dual QUAL (dual Spreadbore for me) seemed quite responsive. And the low height with center-divider design is not shabby.

Way lighter and lower than a Wenzler Dual Quad.

There was a recent run of Bathtub intakes that even take late model heads!
Gasser has to have dual quads at least. Maybe a Warrior TR.

Great to see that. Lotta intakes I see don’t fit late model heads.

I’m not scared to cut the hood ;)

What is this going in? Post up a pic of your car!

56 star chief custom Catalina. Previous owner was planning on doing a quick flip on it and put a 350 Chevy in it, yuck! So I got it and have not had the time or room to take the front end sheet metal off to start getting the straight axle under it. Going to do a front plate mounted 400/462 from the 400 coming out of our 67 GP this coming weekend.

Can you fit an Hei with an offenhauser? Does an Hei fit with any of these dual quads?

Large cap HEIs wont fit most dual quads and tripower intakes.Tom

I have a stock Pontiac HEI and I was considering a DUI. Guessing the DUI won’t fit? Is it enough of a clearance issue where you can’t just notch out the intake a little?

Stock size pontiac dizzy works fine.Tom

Two complete different motors.
462 11:5:1 eddy heads solid roller victor and 1050 dominator.
(428) 440 eddy heads wenzler TR two 750 carbs 10:65:1 Allum rods
Both motors make close to 650 hp and are pump gas motors, see a lot
of street driving and drag-n-drive fun.

GT

Your car will be cool when ready to run! Looks great. Stock HEI is going to be a big PIA to run with any 2X4 intake on a Pontiac IMO. I would recommend running a stock Pontiac Points dist. or an old transistor ignition dist. to trigger an MSD box. Or a small bowl aftermarket distributor. Several brands available. If you can swing it, the Bathtub intake would look absolutely awesome in that car! I have run the old warrior intakes, the Wensler Gutsram, and the Offy 2X4 intakes. They can all be tuned to work fine in a gasser style car. A bathtub wins the best of show award. An Offy 5149 would be the least expensive by far. Good luck with it.

I want to think I have an HEI in the motor I have my Warrior TR on

Id like to run an HEI if I can, I'll have to look around and see what I can do.

KRE's intake with 2 Pro Systems Holleys

Should I do vacuum or mechanical secondary carbs? Street strip car but will drive It to shows when I can but would like to race it when I can too

Here's my favorite 2x4 set up. Offy 2x4 with two 9776 Holleys. They are 450 cfm each for a total of 900cfm. They are flat bowl carbs which means they will mount inline rather than sideways. This simplifies installation with regards to fuel line and linkage. They are mechanical secondary carbs which means no vacuum secondary tuning.
A good alternative would be the AVB style carbs, Tom S can give you good advice on that style carb

forgot to mention they were calibrated for open plenum intake (tunnel ram), and the Offy design would qualify as a low rise tunnel ram (open plenum)

Some of the tunnel ram Holleys do not have power valves in them so if street strip I'd use a primary metering block with one.

9776 Holleys are equipped with a -85 power valve. Kevin's Hallet flatbottom 425 Buick has a pair.

I added them to a pair of 4224s and some 715 VS Tunnel ram carbs(what I ran on my 409 in '72) to use on a project. Hoping a bathtub will fit under a 65 GTO hood!

Do you think that two 450s would be enough for my application? I see a lot of people doing dual 600s/650s/660s

How are the 4224s on the street? Can you mount them inline?

I have not run them but the 715s VS with the VS taken off sideways and all 8 bbls opening at once and no power valve was fine driving to high school and throwing my paper route!

CARB SIZE. to determine if a specific CFM is required, the camshaft size must be factored in. What size cam are you going to use on your "street/strip engine. Let us know. My guess is that anything under 250 deg. intake @.050" lift, an 850 or two 450s will not cause a restriction to air flow.

I asked my engine guy, he might get me a custom grind for what I need. Ill let you know soon

Offy 5499 with Carter AFB’s cloned like SD carbs. Stock dizzy set up by suntuned, here on the form.

Did John build those AFBs?Those are my go to carbs for non tunnel ram 2-4s.Tom

No, but he sure did help. First got inspired when I read his 2 part article on cloning SD carbs in Smoke Signals. Since I had never done a setup like this before, I reached out to John. Spoke to him several times for advice/questions. Still talk to him. He is a true gentleman and great guy.

This is a timely discussion. My engine is out for a refresh right now. Currently running an 850 dp on a Northwind manifold but have always liked the idea of dual quad setup. Engine is a 461 with 10.8cr. KRE D-port heads that were just ported to 325cfm. Cam is 242/248 @ .050 with .585" lift. Car is used for street/strip running a 12 bolt with 3.91 gears and weighs 3470lbs without driver. Would the Tradewind intake with two 450's work for this combo?

pair of 750s on your 461.Run progressive and you will drive around town on the front 2 bbl of your rear carb.You will like it.Tom

It'll be somewhere around this size

242/248, 540/563 with 1.5s

I would suggest you read this thread:
https://forums.maxperformanceinc.com...ight=Dual+quad
As stated in the thread multiple carbs are not cumulative. In other words, 2 450cfm carbs are not the same as 1 900cfm carb. Do your research before settling on carbs that are too small. Tom S and 61-63 are both very knowledgeable on this subject. 61-63 has built SD clones for years and knows them like nobody.
Good luck

Exact goal can also suggest carb size.

If you are looking at Carter AFB's

On your 461, best ET with a pair of the 750 Carters (4760s or 4762s).
Or maximum street drivability with a pair of 625 Carters ( 4759s).

You can make them look very close to SD carbs if desired.

Jon

Just to throw this out as far as CFM sizes my 470" 409 we dynoed with two 750 Edelbrocks(I know guys!) vs 600 cfms. Same numbers so kept the 600s on it.