View Full Version : Smallest 4 bbl, specifically spread bore?

05-01-2017, 01:34 PM
Im thinking of a 4 Bbl manifold for my 2,8. But I don't want to over carburate it. What is the smallest
( in CFM) 4 Bbl?
I thought of a Rochester to keep with the car's GM blood, but I think a spread bore Holley will work better. Is a 650 the smallest spread bore made?

Drop Top Olds
05-05-2017, 01:51 PM
smallest one I see on the Holley catalog


12-27-2018, 01:13 AM
Darn those holley carbs have got expensive. Remember buying brand new #1850's vac. secondary out of summit catalogs 30 years ago for $99.

12-28-2018, 12:07 AM
Holley made a 390 CFM carb that was used on a lot of 6 cyl. applications. Worked nicely on 4.1 ( 250 CID) Chevy Inline 6. I think it had vacuum secondaries as well.

Ken T.