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Thread: Ring end-gap.

  1. #1
    Registered Crazyhorse's Avatar
    My Boats:
    38 Cigarette flat-deck
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    Jan 2001
    Holland MI

    Post Ring end-gap.

    Anyone got the ring end-gap specs for the top and second compression rings for a 4.280 bore?

  2. #2
    Charter Member Charter Member IRONMAN's Avatar
    My Boats:
    Formula 271 15 Whaler
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    Jan 2001
    south east of dome island


    What is the piston, cast,forged or hyputectic sp? Ironman

  3. #3
    Registered David's Avatar
    My Boats:
    1981 Sunkisst Tunnel
    Join Date
    Oct 2000


    It appears there is a major difference if forged vs. cast pistons. Merc says the following: Cast pistons (std bore,4.250) top ring=.010-.018, second ring=.016-.024. Forged pistons (std bore, JE/GM, 4.250)top ring=.015-.025, second ring=.015-.025. With a .030 overbore, I would add .001 (max)to the min/max numbers. Also--these #'s are for normally aspirated engines. S/C specs are different.

  4. #4


    I'd suggest .0045 per inch of cylinder bore in a naturally aspirated application. In your case that's .019 ring end gap. My personal preference is to match the top and second ring gap, but there are all sorts of opinions on that. If in doubt, go bigger!! To much gap is much better than contact.

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