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Stock rotating assembly H/C lt1?

This is a discussion on Stock rotating assembly H/C lt1? within the LT1 forums, part of the Vehicle Specific category; I have done searches and can not find any solid answers. I have plans to build a 97 lt1 with ...

  1. #1
    Junior Member
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    Sep 2006
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    DSG
    03 Cobra

    Stock rotating assembly H/C lt1?

    I have done searches and can not find any solid answers. I have plans to build a 97 lt1 with either an AI 185 or AI 200 heads and cam package with all of the supporting mods:
    AI ported intake
    30 lb inj
    52 or 58mm tb
    1 3/4 LTs + y pipe
    maganaflow catback
    CSR elec water pump
    255lph intank pump
    And many nickel and dime mods
    I was planning on going with a forged rotating assembly or at least a set of SRP pistons, but I have reached the end of my budget. By going into the shortblock, I would have to shell out more money for machine work and balancing on top of the parts.
    I plan on tearing down the engine soon. I will check the cylinders for wear, out of round, and taper. If it looks good I will clean up hone it replace the rings, bearings, and add arp rod bolts.
    I know that the stock pistons are not the strongest, what I would like to know is : Will it last as long as it is kept N/A, has a safe tune without any detonation, and the rpms are kept within a safe limit?
    I have seen quite a few stock lower end heads and cam cars run well into the 11s............ But how long do they do it for?

  2. #2
    Senior Member 5.0THIS's Avatar
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    red
    95 Z28

    Just depends on the condition of the bottom end now. To get any more power out of the motor with H/C, you're going to need to rev it higher, which in turn will put more stress on all of the parts. You're also going to have higher cylinder pressures anyway. Kind of a crapshoot. The stock crank will not be a limiting factor, but for safe high rpm operation, the balance of the entire rotating assembly is crucial. When you rebuild the bottom end, I would suggest better pistons and rods. Better to do it once and do it right.

  3. #3
    Member camarolvr69's Avatar
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    1997 camaro z28

    changing to 4 bolt mains would help with reliability issues winding the motor up to high rpms ..just a thought

  4. #4
    Senior Member 5.0THIS's Avatar
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    red
    95 Z28

    At those power levels a 4 bolt main isnt needed IMO. I've built many racing engines, and a few have had 2 bolt mains, and the motors spent their entire racing lives running between 3000-7000rpm. Never a failure due to crank movement or cap failure.

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