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- Carter Dual 4-Barrel Carburetor Idle Adjustment
- Carter Dual 4-Barrel Carburetor Adjustment
- Carter Dual 4-barrel Carburetors, Linkage Sticking
- Buick Cam Specifications for 401 and 425 nailheads
- Buick Cams from Kenne Bell, 401, 425
    - Nailhead Engine Specifications
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- Nailhead cam specs and cam selection
- Nailhead Parts Interchange
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Thread: Nailhead header capacity

  1. #1

    Nailhead header capacity

    I have home made headers on my 401 that have individual header tubes 1&1/2 in leading into a 3 in. collector.
    I am replacing this with a 425 bored .040 and I'm told that 1 will need to use 1&5/8 in. tubes.
    This is a street machine and probably will seldom reach 5,000 RPM.
    Can anyone out there give me some advice here.
    I would like to use my exhisting headers on the 425.
    Thanks an

  2. #2

    Headers

    That 1/8th inch will make no difference. I guarantee, if a Buick dealer installed a .040 engine in a customers car, they would use the same manifolds. Ben

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