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  1. #1

    FS: 90mm Pistons/Cylinders

    For Sale:

    3 - Brand new 90mm Wisecos (hopatcongGPR Big Bore Kits)
    3 - GPR 66E cylinders - Welded boost and bored to the 90mm pistons + plating clearance- ready for porting and plating. I used 66E because the stock porting requires less porting for a ported setip

    $750 complete shipped in the USA.

    Will split pistons from cylinders for reasonable offer
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    Last edited by MTRHEAD; 07-24-2008 at 07:13 PM.

  2. #2

  3. #3
    TTT - Will sell cylinders or pistons

  4. #4

    Join Date
    May 2006
    what exactly do you need to make this a ready to go top end.

    example heads porting

  5. #5
    Cylinders need porting then plating - (they come welded and bored)

    Cases need some minor clearing for the pistons on BDC (bottom dead center)

    A cylinder head needs to be cut - OEM (Lowell) or waterdogz billet or custom.

    Do a search - many 80-90mph boats have these.

  6. #6

    Join Date
    May 2006
    Around how much more would this cost to finish

  7. #7
    My thoughts on prices: You could ask others like Hopatcong/yudluz/philipgpr what they spent but many of us do lots of our own work.

    Plating/honing ($350 give or take? its been a few years - others chime in?)
    Porting - could be nothing to skis the limit..probably $300 for some porting
    Head - $150 give or take to have the OEM modified
    Ex Valves - If you have some just grinding to clear

    The feel of unreal acceleration ---- PRICELESS!!!!

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