Thread: Pre Top Swap Questions

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  1. #1 Pre Top Swap Questions 
    GT Level Member Points70's Avatar
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    Ok I found a GTP in the junk yard, it was wrecked from behind. Im getting the whole engine and transmission cheap because we know the owners well. My questions are what exactly do i need to pull off the old engine to make this work the best. The super charger, LIM, Fuel rail, for sure. But now what? Can I use the GTP stock fuel injectors or do I need to buy different ones? Can the stock PCM work for it or do I have to get it re-programmed? Should I use the GTP stock Rockers? In the future I want to put a cam in it so ill need new springs and re-tuned PCM for that. Anything else I should take? Also what is a Built transmission? Can I tear apart this extra one I have and add parts to it? Thanks for the Help
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  2. #2 Re: Pre Top Swap Questions 
    GTX Level Member blakgtp's Avatar
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    what kind of condition is the motor? why not just swap the whole thing?
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  3. #3 Re: Pre Top Swap Questions 
    GT Level Member Points70's Avatar
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    I heard it is way better to have a top swap on a GT because of the compression ratios
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  4. #4 Re: Pre Top Swap Questions 
    GTX Level Member blakgtp's Avatar
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    better is always subjective, i wont say too much because i'm not an expert on these motors but i think there would be less chance of issues with the l67
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  5. #5 Re: Pre Top Swap Questions 
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    ***This swap intended for a swap retaining the L36 Harmonic Balancer. Although you can change it out, I did not. You cannot run anything smaller than a 3.25 SS pulley with the stock GT balancer***

    You will need:

    L67 Throttle Body
    L67 LIM
    L67 Heads
    L67 Fuel Rail
    L67 Injectors
    SS Pullies, standoff and idler
    M90 Supercharger
    Spark Plugs
    All new gaskets
    All new bolts
    Coil bracket
    Coolant
    3 inch downpipe
    Cold Air Intake system
    New O-Rings
    Custom Tune for a Top Swap



    Found this. It just doesn't seem like is that much
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  6. #6 Re: Pre Top Swap Questions 
    GT Level Member Points70's Avatar
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    Yes I would presume there would be less issues if i just swap it. But I like working on my Car and taking it apart and putting it back together
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  7. #7 Re: Pre Top Swap Questions 
    GTX Level Member blakgtp's Avatar
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    not sure if the car is your dd or not, but if it is, wouldnt it be nice to build the l67 since its already out of the car, put in a cam..etc. and meanwhile u can still drive your car
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  8. #8 Re: Pre Top Swap Questions 
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    Good point. This is my DD but in the summer I can usually only have to get to work and i can arrange that for a while, and we are trying to buy a bike to save on gas in the summer. So If we get the bike, I can have this car sit for a week without any worries
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  9. #9 Re: Pre Top Swap Questions 
    Killa Bee Scottydoggs's Avatar
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    X2 on that one, get the l67 and work it over, and swap it in at a later date. your much better off with low compression and a sc.


    grab the pcm and the engine harness from the donor car.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  10. #10 Re: Pre Top Swap Questions 
    GT Level Member Points70's Avatar
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    Ok thanks. Yea Im starting to think it over. It is easier to change things when the engine is out of car. If i put a cam in the GTP engine can the stock transmission handle it if I don't stomp on it all the time?
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  11. #11 Re: Pre Top Swap Questions 
    Killa Bee Scottydoggs's Avatar
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    take the trans with the donor engine, its a HD trans.

    if you have the funds send it out to be rebuilt. 4 th gear hub likes to strip out in the older trannys, 97-03 i think, its worth changing that.

    and get headers for when you do the swap as well.

    what kind of miles and year are the engine and trans?

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  12. #12 Re: Pre Top Swap Questions 
    GT Level Member Points70's Avatar
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    Not absolutely positive on year and miles. Will find out Monday, but it is somewhere between 97-03
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  13. #13 Re: Pre Top Swap Questions 
    club of used to own a gp 99prixgt's Avatar
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    if its your dd, id suggest no cam or something small

    my xp car eats through gas around town, my non cam car just sips gas.

    eventually your trans will eat itself with a cam
    16' wrx sti- stock
    06 Spice Red GTO- m6/exhaust/tune/suspension/377whp-383tq-sold
    99 silvermist gp gt-g5/xp/IC/3.0mps-parted&sold
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  14. #14 Re: Pre Top Swap Questions 
    PittState Automotive Tech GAFF's Avatar
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    Don't listen to anyone and top swap the car.. I top swapped mine when I had it and it was beating L67's freshly built with a 3.4 pulley and cam.

    My top swap was a basic swap, no cam or smaller pulleys. Just a supercharger with the higher compression.

    Once it was tuned correct, took a bit but it ran very nice, loved it.

    My trans held up fine after the swap. The trans was rebuilt at 80k and the swap was done around 95k miles and I sold the car with about 18k miles on the swap. But if yours hasn't been re-hauled recently it would be a great idea to get one built with the needed stronger components.
    SOLD 1999 GT Silvermist TS
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  15. #15 Re: Pre Top Swap Questions 
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    Ok thanks for all the input. I really do want to do the top swap but swapping engines would be easier. AHHh im still going to look through it
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  16. #16 Re: Pre Top Swap Questions 
    Killa Bee Scottydoggs's Avatar
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    the easiest way to go is to just swap it all over, engine trans and pcm.

    unless you have a local tuner.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  17. #17 Re: Pre Top Swap Questions 
    PittState Automotive Tech GAFF's Avatar
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    Any questions about the swap let me know, I'm never on this forum anymore so just shoot me a PM.
    SOLD 1999 GT Silvermist TS
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  18. #18 Re: Pre Top Swap Questions 
    club of used to own a gp 99prixgt's Avatar
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    do you have a tuner and know how to tune?

    if the answer is no, you don't want to top swap
    16' wrx sti- stock
    06 Spice Red GTO- m6/exhaust/tune/suspension/377whp-383tq-sold
    99 silvermist gp gt-g5/xp/IC/3.0mps-parted&sold
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  19. #19 Re: Pre Top Swap Questions 
    PittState Automotive Tech GAFF's Avatar
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    Quote Originally Posted by 99prixgt View Post
    do you have a tuner and know how to tune?

    if the answer is no, you don't want to top swap
    Oh yea. I had my own tuner.
    SOLD 1999 GT Silvermist TS
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  20. #20 Re: Pre Top Swap Questions 
    GT Level Member Points70's Avatar
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    i do not have my own tuner
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