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Does GM have an official maximum power rating for a stock block?

This is a discussion on Does GM have an official maximum power rating for a stock block? within the General Help forums, part of the LSx Technical Help Section category; The new GMPP LSX iron block is good for up to 2500 hp. Is there an official rating from GM ...

  1. #1
    Member since 1998 DarthD's Avatar
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    Black ASC#7564 May11,2001
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    Does GM have an official maximum power rating for a stock block?

    The new GMPP LSX iron block is good for up to 2500 hp.

    Is there an official rating from GM on how much power a stock aluminum block and stock iron block can handle?

    Is there an official GM rating for the Gen 1 and 2 blocks?

    I tried search but all I can find are people's opinions on what a block may be able to handle. I would like to know the "official" rating.

    Thanks

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    Alcohol Injected PaganEgyptian's Avatar
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    I havent heard an official number probably becuase GM doesnt have one themselves. I hate to say it, but QC on LS1 engines are chit. the ratating assembly tolerances out of Mexico are nightmarish. Eagle isnt what is used to be. That why LS1 are king of bearing spinners. They are all different in quality, just like the blocks. My friend had a defective LS1 block in his 2000 C5 and it popped at around 1100HP I think due to a bad casting spot in one of the cylinders. So if it holds that much being defective, I would say 80% of that would be ok within a saftey margin. -Tim

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    Member GA Country Boy's Avatar
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    I've also never heard a factory come out and say "you can push our blocks to XXXXHP before it blows". Their only concern is being able to handle what it was designed for with a good safety margin. I've never had a major concern with the block...it's always been the head gaskets and the heads (assuming you've replaced the internals with forged pieces). But anytime you start pushing a motor way beyond what it was intended for everything has to be done right.
    Michael
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    Quote Originally Posted by PaganEgyptian View Post
    I havent heard an official number probably becuase GM doesnt have one themselves. I hate to say it, but QC on LS1 engines are chit. the ratating assembly tolerances out of Mexico are nightmarish. Eagle isnt what is used to be. That why LS1 are king of bearing spinners. They are all different in quality, just like the blocks. My friend had a defective LS1 block in his 2000 C5 and it popped at around 1100HP I think due to a bad casting spot in one of the cylinders. So if it holds that much being defective, I would say 80% of that would be ok within a saftey margin. -Tim
    If my LS1 block can handle just under 1100hp before it blows, I wouldn't consider than defective. That's over 3 times the stock hp.

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