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Thread: Smallest 4 bbl, specifically spread bore?

  1. #1
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    Default Smallest 4 bbl, specifically spread bore?

    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?



  2. #2
    Senior Member Drop Top Olds's Avatar
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    smallest one I see on the Holley catalog

    https://www.holley.com/products/fuel...y/parts/0-8007
    1959 Chevrolet Apache 31 235 I-6 SM420
    1971 Oldsmobile Cutlass Supreme Conv 350-4 V8 THM350
    1988 Chevrolet Celebrity Eurosport 2.8 V-6 Getrag 5 Speed

  3. #3
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    Darn those holley carbs have got expensive. Remember buying brand new #1850's vac. secondary out of summit catalogs 30 years ago for $99.

  4. #4
    Senior Member Century7667's Avatar
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    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.

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