Need some advice from 2-bbl iron intake experts

[Carnut1]

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327- 300 hp many. Iron, 585 Carter, had one on my 1965 Impala SS 327- 300 hp.

[Walter R. Malik]

327- 300 hp.jpg327- 300 hp many. Iron, 585 Carter, had one on my 1965 Impala SS 327- 300 hp.

YES ... the manifold looked similar to this one. The carb pad was very different.

There are a few on EBAY right now ... 1962-63, casting number 3799349 listed as 327/300HP, for use with Carter AFB carb.
It has the same carb pad as what we tested. It looks to have slightly wider runners; maybe not.

[Keith Morganstein]

I have seen on multiple occasions where going from a factory 2bbl iron intake/carb to a factory iron 4bbl intake/q-jet made absolutely 0 difference in performance. Granted, these were not “full race” or even “1/2 race” sbc’s (307’s and 350’s with stock exhaust manifolds and stock or small cams), but I was pretty surprised that going going from a tiny Rochester 2G or slightly larger 2GC to a 750 Q-jet made no difference in 1/4 mile times or top speed.

I guess the biggest thing is going to be where the biggest restrictions are. How good are the exhaust manifolds on whatever it is your building? What kind of power will these things make? Is porting allowed?

Most of the 2-bbl classes usually are all 350" SBCs. What else runs in 2-bbl classes?
.

Those 350 SBC will make a LOT more power with a 4bbl in circle track trim.

[pamotorman]

GM racing says best cast iron manifold is 14096241 or 14096011.the difference is head bolt pattern

[Keith Morganstein]

I think the OP is building a 270” Studebaker V8

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[midnightbluS10]

Would this thread help at all? There's a link on CF to the ncrs forum where they discuss it, also.

https://www.corvetteforum.com/forums/c1 ... 468-a.html

[travis]

Just based on looks, that 2bbl intake looks pretty good!

[PackardV8]

For true; even without the truck riser block, the 2-bbl is a couple of inches taller than the 4-bbl intake.

It was suggested to mill off the 2-bbl pad and make a 4-bbl fit, but it slopes off too abruptly; can't mill air.

[Tuner]

I would auger this 4 bbl intake out to fit a QJet. Use a spread-bore to square-bore adapter as a spacer and open the manifold carb flange and spacer up as much as possible to the spread-bore configuration. The "narrow AFB" bolt pattern already fits the QJet bolt pattern. The QJet with its air valve secondary will give the widest power band and functional RPM range with the power advantage of a very large low restriction carb. Besides, the competition will spend so much time staring and mumbling about it they will completely overlook the secret advantages elsewhere in the car, flux capacitor charged inverted gravity control downforce thrusters and whatnot.

[Keith Morganstein]

What is the dimension of the largest surface you could mill flat on this, (the bulges below the carb pad) ?

Can you mill to that, open it up enough, make a spacer / adapter to bolt onto the manifold, then mount an AFB.

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[Keith Morganstein]

You can have a 500cfm 4412 modified to flow a lot more.

Looking back at the 2bbl truck manifold, it’s an X shape with a sharp turn before the cylinder head. Manifolds like that haven’t been so good on other makes.(old torker manifold)

The four 4bbl manifold has room for opening up for bigger carbs.

Are you going to dyno this engine with both styles of manifold ?

This 2bbl manifold below is easy to make into a 4bbl. It might be the same basic casting as the 4bbl tho...

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