Carb CFM Question ??

[AutoInsane]

I am going to put an Edelbrock 2131 intake on my 1974 Jeep CJ5 with a 304 V8 and I am trying to find out what size carb to put on.

First off the Jeep is a fully restored show Jeep.... no off roading! It has 9:1 compression, a mild cam, Jet Hot coated stock exhaust manifolds (which flow pretty well) and a stainless free flowing exhaust.

The RPM range is quite low and I would say the max would be 3500 RPM.

When I run the numbers on a 'CFM calculator' it would seem the Holley 0-8007 with 390 CFM would be fine.... That just sems a bit meager to me... I guess I am guilty of more is better!!!

Thoughts??? Thanks!!

[markjohnson]

Happiness is usually a smaller carburetor! For your application, I'd buy & install a nice brand, new 500-600 CFM Edelbrock Carb with an Electric Choke. Bouncy Off-Road vehicles respond very well with the way they are constructed, having the jets horizontally at the bottom of the float bowl chambers.

[VintageMusclecar]

A basic Holley LIST 1850 would work just fine, and best of all they're dirt cheap.

It's a shame no one offers an affordable spread bore manifold for this application. If you're willing to run an adapter, I think a quadrajet would be a great choice here. The tiny primaries offer superb throttle response and efficiency (i.e. gas mileage), they're reasonably easy to fine tune if you start with the appropriate unit to begin with, and the later units provide for an electric choke.

A unit off of a late `70's Chevy/GM SB truck would probably work exceptionally well since the truck carbs are calibrated for strong low rpm performance.

Just my $.02
Eric