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Hot Rods Duntov Cam Valve Springs

Discussion in 'The Hokey Ass Message Board' started by Trent R., Dec 5, 2023.

  1. Trent R.
    Joined: Apr 27, 2021
    Posts: 53

    Trent R.

    Hoping someone can give me some insight as to what valve springs to order for my 283 build. We are hoping to go with the 097 Duntov can with solid lifters and original power pack heads but am confused about what lift valve springs to order. They seems to range from .450 to .550 lift. Which ones would be best in this application?

  2. onetrickpony
    Joined: Sep 21, 2010
    Posts: 747

    from Texas

    The Z28 springs are great with that cam and are usually very inexpensive.
  3. 1biggun
    Joined: Nov 13, 2019
    Posts: 431


    Last edited: Dec 5, 2023

  4. Fordors
    Joined: Sep 22, 2016
    Posts: 5,304


    All the SBC’s used the same valve spring, even the high-perf engines. The so called Z28 spring is the over the counter 3927142 spring designed for the 3927140 “off-road” cam. Easily identified by their brown paint they had a higher pressure on the seat as well as at full lift. The ‘142’s have a seat pressure of 110#, as compared to stock Chevy springs at 80#.
    Aftermarket vendors sell what they call Z28 springs, I guess those have the higher pressure of the ‘142’s at their installed height of 1.70”. The ‘142’s have been long since discontinued. Bottom line? If you have stock Chevy springs that check at 80# at the 1.70 installed height use them, the gentle action of factory GM cams are all they need.
    Desoto291Hemi likes this.

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