Thread: Is this Carb Big Enough

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I have an 76 Ford F-150 Ranger Automatic with a Lage Block 460. With a
600 Edlebrock Carb. IS this Carb big enought for this motor or shold I go bigger.


Thanks.

A lot depends on what you're trying to do.

I've run a 600 cfm smog Holley carb on my mildly built 462" Buick a few times and it ran ok.
Although, being jetted quite lean it didn't start pulling hard until it was on the verge of the secondaries popping open.

If you're just running around with the truck and the engine is close to stock, I'd just drive it and not worry about it.

If you run it up to 5000 RPM, the calculations say it's OK.

(5,000 x 460)/3456 * .85 = 566 CFM

I dont like that formula peronally. even within 5000 RPMs Id want 690 cfm...so Id use either a 670 Holley at a minimum..or better yet a BG725

Originally posted by stepside454
I dont like that formula peronally. even within 5000 RPMs Id want 690 cfm...so Id use either a 670 Holley at a minimum..or better yet a BG725

Depends on the internals of the engine. If it's stock, 600 will work fine.

An engine is just a big air pump. That formula describes it perfectly. The only assumption is the volumetric efficiency. a 670 assumes 100% volumetric efficiency, and that won't happen with that engine. However, I don't have a problem with a little oversize as you recommend. Gives room for later expansion.

my 460 with a 600 Holley would rev way beyond what my 'testicular fortitude' said was enough

I have a 75 1/2 4X4 Ford with a 429 built from a 70 Tbird and a 460 in a 73 tbird that pretty much stock and both have 750 holley on them. They perform rather well. But if you are doing daily driving with your edelbrock and it doing ok, I wouldn't replace it.

so preaty much just leave it. The motor is preaty much stock for now. But the piece I am adding is a hight rise edlebrock intake.
But for some reason thir is a major hasesation in the carb when you stand in it and I can't figure out why.

Well here is one for you. I am about to upgrade the ignation system on my truck. Like coil, plugs, plug wires, preaty much everything what would you reconmend.

If its when you stand on it from a standstill then its either your intack or your accelerator pump needs adjusting or repaired. I have a 75 1/2 ford 4x4 with a built 429 and I thought I had a problem with hessitation while slowing down and then accelerating. I figured out that my transmition was not down shifting below 3rd gear until I got to about 25 mph. So I was trying to go fast in 3rd gear in anything about 25mph. If I shifted manually then I had lots of power, otherwise its would chug little until I got into it. I have a shift kit in the works. I had played with the carb and timming till I figured out what was going on. I think it has something to do with the 70's trying to save gas and shifting way too soon.

I have a '78 F-150 with a 460 and edelbrock 600, which in stock form is actually way too big. The factory calls for a 570 cfm.
My tranny was doing the same thing as RMN's.
One thing that helped was taking some fluid out (it was WAY over-filled) That kept it from stalling. I'm going to get a new vaccum modulator today, when I figure out which one I need there's 3, sorted by color, but mine just looks brass.
different colors mean different shift timing, or so i'm told.