Technical & General Discussion Area > Tech Torque Pre 1973

Carb for 302

(1/4) > >>

FickleLife:
I’m looking for a new carb for a mild 302. Looking for best street options.

I was thinking either Holley Street Avenger 570 or the Summit 600 carb. I’m leaning towards the summit as it has annular boosters, has additional hardware such as fuel rail and heat spacer, and is about 700aud landed vs 900+ for the street avenger (plus another hundred or so for that missing hardware)

Just wondering if there are any other options or thoughts from the brains trust before I make a call?

GEOFF289:
Both are technically too big for a mild 302.

https://performanceimprovements.com/blogs/news/carb-size-matters-what-size-carburetor-do-i-need

The numbers in the formula the link provides come out to about 408 cfm. That said, there are probably more 600 cfm carbs on these engines than anything else, like mine. I had to go down a few jet sizes from what the carb came with to get it within the bounds of a reasonable afr but its still richer than is ideal.

Micks66coupe:

--- Quote from: GEOFF289 on August 07, 2022, 06:03:25 pm ---Both are technically too big for a mild 302.

https://performanceimprovements.com/blogs/news/carb-size-matters-what-size-carburetor-do-i-need

The numbers in the formula the link provides come out to about 408 cfm. That said, there are probably more 600 cfm carbs on these engines than anything else, like mine. I had to go down a few jet sizes from what the carb came with to get it within the bounds of a reasonable afr but its still richer than is ideal.

--- End quote ---

I agree with Geoff on this, going to big with carb selection is a common problem and assuming bigger is better is the wrong way to go. I run an Edelbrock AVS2 500 CFM on my 289 which also has Edelbrock Performer manifold, electronic ignition and tuned length extractors. Follow Geoff's link and do more research before you order anything, and for the record over the years I've run Holley's, Edelbrocks, Carters and even an Autolite 4100 carb (still got that one tucked away)

FickleLife:
Thanks Geoff and Mick

I’ve added the AVS2 Carburetor #1901 500 CFM With Electric Choke to the list and is the front runner.

Looking at the options for 500cfm it doesn’t look like there’s much out there with 4 barrels other than the Edelbrock https://www.summitracing.com/search/part-type/carburetors?N=cfm-range%3A500-599-cfm%2Bnumber-of-barrels%3A4

Is there any other brands I should consider?

pmb0186:
I run a stock 289 with a autolite 4100 1.08 and it’s fine and probably ok for a mild 302
If I didn’t have that I would go Holley 570 vac secondary or the summit as you suggested
A larger carb will not effect performance but drive ability and fuel economy within reason.
I would keep away from anything double pumper.
As for tuning out of the box 9 time out of 10 will be ok.
Unless it drives like a pig do a colour check on plug and drive it

Navigation

[0] Message Index

[#] Next page