Yet another question about valve lash - big block - NCRS Discussion Boards

Yet another question about valve lash - big block

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  • Everett Ogilvie

    Yet another question about valve lash - big block

    Why did Chevrolet change the recommendation for big block solid lifter valve lash? The 1966 Chassis Service Manual says the 425HP engine should have .024 exhaust and .020 intake. The '67 and later materials, including the Power Manual recommend .028 exhaust and .024 intake. Will either set of numbers work on all these engines, or is there a reason the '66 specified tighter clearance? What are the pros and cons (again)? Thanks for any inputs.
  • Clem Z.
    Expired
    • January 1, 2006
    • 9427

    #2
    Re: Yet another question about valve lash - big bl

    the looser lash will give a better idle and also increase the bottom end power.

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