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Thread: formula needed

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  1. #1
    unkamort is offline CHR Member Visit my Photo Gallery
    Join Date
    Aug 2004
    San Francisco
    Car Year, Make, Model: 1938 Ford pick-up

    formula needed


    I'm workin' with a 400M engine, the block has been decked, and the heads got a shave. No spec on either one of those. The valve lift on this cam is .468, duration (@.050) is 206 degrees. I'd like to up grade from stock rocker arms (1.6/1) to full rollers. Ford motorsports only sells 1.73/1 units. Question: How much more valve lift am I gonna' see... enough to worry about VPC problems?
    Some day I be shinin' in the Boulavard windows

  2. #2
    Henry Rifle's Avatar
    Henry Rifle is offline CHR Member Visit my Photo Gallery
    Join Date
    Apr 2004
    Little Elm
    Car Year, Make, Model: 34 Ford Low Boy w/ZZ430 Clone

    Your valve lift goes from 0.468 to 0.506.

    (4.68*1.73)/1.60 = 0.506

    I can't tell you about clearance. Since you have no spec on the head milling, the safest way is to measure it by pulling a head and using clay.

    Gone to Texas

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