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MPFI pistons on a 2000+ 3100?

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  • MPFI pistons on a 2000+ 3100?

    Will 3.1L MPFI pistons work in the large port 2000+ 3100 engines? Valve clearances still ok? Will the piston come proud of the deck too much and contact the head? Anyone know for sure?

  • #2
    I used the gen 1 3.1 pistons in my 3100 (late 1999, but almost identical to 2000).

    It will jack your compression up quite a bit.

    I want to say I was using the camaro 3.1 gen 1 pistons with the iron head headgaskets.

    It did have some issues, but nothing tuning couldn't take care of.
    Taylor
    1988 Olds Cutlass Supreme 3100 MPFI
    1990 Pontiac Grand Prix STE 3.1 MPFI
    1994 Olds Cutlass Supreme convertible
    1998 Lincoln Mark VIII
    "find something simple and complicate it"

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