Carb size

[Ed51]

Ok it isn't a W-block,maybe someday,but what would be a good size carb for my 377? The one that I have on it now seems like it moves stiffly,I think there are other problems as well. I do not intend to race,just want to cowboy it around on the street. 600,650,750 ? Suggestions?

[Va348]

Ed51

It really boils down to what intake manifold you have.

Dual plane Like Edl 2101 or 7101 = 750

Single plane Like a Victor Jr and so =650


Dale

[Ed51]

Performer RPM dual plane..

[Bungy]

Sounds like this is mainly a street engine so I would go with a 600. If it has a single plane intake and is a high rpm engine then I would go with the 750. JMO

[Fran Preve]

Ed: "moves stiffly"?. Better description needed. Rear axel gears?. What's the car?. What kind of carb is on it now?. Size?. Is gas mileage of any importance?. All that will be needed to narrow down what MIGHT be best. BTY, he's running a 400 block with a 350 crank, big bore/short stroke. Oh, cam spec's?.

[Ed51]

The carb is an Edelbrock of undetermined cfm rating.The linkage moves stiffly,needs a lot of return spring and the choke(electric) when it is up on the fast idle cam runs 2200 rpm. The carb came with a bunch of stuff that came with the engine. It looks like it may have seen better days. Engine is a 377 with Crane 272 hydraulic cam.3:36 rear gear,close ratio muncie in a 63 Impala. I am not intending to do any racing,just cruising around mostly. After the choke calms down it drives OK but the secondaries seem late coming in.I'm thinking about an AVS,just don't want to go too big or small. :confused:

[dq409]

Go with the AVS 650 !! Happy trails !!!!! ,,,dq

[Fran Preve]

What dq said, Summit sells a rebuilt unit that would work just fine for you. But I would change the close ratio for a wide ratio, should be a no cost swap, buy wide sell close for what wide cost. If your not racing going from 2.20 low to 2.56 will be a BIG help getting your car moving (changes your 3.36 to 3.70). Unless you race the car wide ratio is better.

[Rockfish39]

Edelbrock AVS-AFB !!!!!! Excellent choice ! :cool:

[Ed51]

I always preferred the AFB in the past mainly because Holleys always ended up leaking. Anyway 650 AVS is what it will be. Hmmmm maybe I should get a smaller one,what with the latest contrived crisis from the government (that being the run-up is gas prices...) so I can "do my part". What BULL$**T! :cuss

[jester]

Cubic inchs multiplied by maximun rpm then devide by 3456 should give you a good starting point for CFM for a carb on a stock engine ( not motor)