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Thread: 396 to 427 ???

  1. #1
    Junior Member APPRENTICE
    Join Date
    Mar 2005

    396 to 427 ???

    I've often heard that you can bore a pre 1972 396 to a 4.25 with no problems because the 396 and 427 in those early years came out of the same cast ?? Any truth to that ?

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Sep 2007
    Yes you can I know a guy that did it, but I'm not sure which blocks you can do it with. I'd have it sonic checked first to be safe.

  3. #3
    Senior Member DYNO OPERATOR
    Join Date
    Aug 2007
    Lost Creek, WV
    If memory serves me right it was the blocks with an IE or IF stamping. But like Tod said, have it sonic checked first.


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