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Thread: comatabillity of 1st gen 4g64 to 2nd gen 4g64 pistons

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  1. #1

    comatabillity of 1st gen 4g64 to 2nd gen 4g64 pistons

    I am selling my new galant gs pistons that Iv'e had forever and am wondering the interchange compatabillity of the 1st gen 4g64('94-'98 galants - 99 spyder 4g64 eclipse) to the 2nd gen 4g64(evo orientation) motors. The pistons are for a 1994-'95 gs galant(10:1 comp. ratio) on '99 spyder eclipse rods. Will they fit in the 2003 4g64's without minimal customizing? Thanks.

    1994 Galant S. 90 Percent GS.

  2. #2
    Experienced TGC Member mysticj's Avatar
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    08-18-2004
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    Yes, they will fit just your intake valve relief will be on the exhaust side and vice versa.
    94 Galant GS: 4G67 head, 1G IM, Evo 8 TB, DeltaCam 272/264 Cams, Test Pipe, OE Avenger V6 60mm catback w/muffler, modified Outlander header, DIY COP setup, B/S delete, 315cc injectors, AEM UEGO WBO2, Black case 3G ECU

    1994 GS FYI
    DSM/CSM Manuals

  3. #3
    So they wouldn't slap the intake valves even though the reliefs are on the exaust side?

    1994 Galant S. 90 Percent GS.

  4. #4
    Moderator mko's Avatar
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    on theory they should work, i dont think its been tested yet
    God created turbo lag to give the v8's a brief moment of hope.



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  5. #5
    ok, I'll let the guy know that they should work, but there is no guarantees. he should turn the motor over by hand and see if there feels like there is anybindage. thanks guys.

    1994 Galant S. 90 Percent GS.

  6. #6

    Pistons

    Hey bud are you talking about the 10:1 pistons for 94 GS? Do you still have them?
    91 Galant GS, 7G 2.4 DOHC conversion 9.5:1 CR, 4 speed auto, 15" Mitsu rally wheels, 19560r15 Hankook Optimo
    98 Chevy Metro, 1.3 16V, 5 speed manual, 14" wheels
    96 Geo Metro, 1.0 3 cyl, XFI trans and cam, 64 MPG
    94 Hyundai Elantra, 7G 2.4 DOHC conversion, 10:1 CR, 5 speed, 19560r15 Falken ZE 912, 2.25 catback *****SOLD******

  7. #7
    why would the intake relief be on the exhaust side the manifolds are in different positions that tb just faces on the other side so the valve pockets should line up just fine

  8. #8
    Sorry for taking so long....sold the pistons and he used them just fine.

    1994 Galant S. 90 Percent GS.

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