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Thread: Circle Track Engine Swap

  1. #1

    Circle Track Engine Swap

    I have a 1990 Pontiac Grand Prix which I Circle Track Race. It has the Gen II, 3.1L V-6 motor.



    We have been getting beat pretty regularly over the last 2 years, but it was a good safe beginners car and I didn't mind so much.

    We put together a 2nd Grand Prix, which had the 3100 MPI motor.. and with the help of folks here, we were able to mod that motor enough to make it a 1st place car !



    But the driver of that car has really matured and we are ready for two fast cars.. not to mention.. the competition has gotten a lot faster. 3.5L Dodge Intrepids, Ford Taurus SHOs, Chevy Lumina GTZs..

    So the question becomes.. what is the optimal thing I can do to make this 1990 Pontiac Grand Prix scoot !

    Switch to a 3400 ? a 3500 ?? a 3800 ?? maybe swap in a 3.9L ???

    What do you guys think.. off from a 90 W-Body Grand Prix what is the best bang for the buck we can make.

    Remember.. Circle Track.. not Drag racing. No Turbos, No Super Chargers.

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  3. #2
    Constantly Overachieving Merlin's Avatar
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    im glad that we helped you guys get in the spot you needed to be in.


    on the talk of what engine next, i would go for a 3400. they seem cheap and easy to access at the moment.
    Justin

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    For more information about the L67 swap into an F-body, please click here

  4. #3
    Isn't the 3400 DOHC motor very unreliable ?

    Or are you talking about the 3400 out of like a mini-van ?

  5. #4
    Full Throttle Z28_DAD's Avatar
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    the 3400 are in alot of other cars besides the mini vans. one that comes to mind is a 2001ish monte carlo ls
    2001 Buick Regal GS-Black
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    1998 Pontiac Grand Prix GTP-Silvermist Coupe
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  6. #5
    Project Sturmvögel WarShrike's Avatar
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    If you look up the Brunton Stalker (Lotus 7 inspired chassis), they commonly use the 3400 on their cars. The Brunton Super Stalker is an L67 Supercharged 3800, and evil as all get out.

    And congrats on the WIN!
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  7. #6
    Quote Originally Posted by Z28_DAD View Post
    the 3400 are in alot of other cars besides the mini vans. one that comes to mind is a 2001ish monte carlo ls
    Is the 3500 the same motor ? Is the 3400 better ??

    Is there a good guide for swapping ?

  8. #7
    Full Throttle Z28_DAD's Avatar
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    3500 is much better from what i understand. aside from displacement, the intake/heads flow alot better from what i understand
    2001 Buick Regal GS-Black
    cat delete-FWI

    1998 Pontiac Grand Prix GTP-Silvermist Coupe
    S&S headers-FWI-3.4-180*stat

    To do list-inlet & outlet ported, outside fully polished, intercooler, LS1 t/b

  9. #8
    I'm hearing that the 3400 can go in without changing the wiring harness, uses the same motor mounts as the 3.1 and is basically plug and play.

    There is a rear motor mount bracket which is needed and can be purchased over the counter and the next generation tranny is recommended... but I'm wondering if its needed for Circle Track.

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