Quote:
Originally Posted by WSSix
The sleeves of the LS7 block take out so much material out of the block itself. GM even says the LS7 is not deigned to handle boost which is why they put a blown LS3 under the hood of the ZR1. They added some more doodads and changed a couple more parts and called it an LS9. It's a fancied up LS3 at it's core though. The ZR1 is only running 10 psi too and GM wouldn't let the LS7 be used because of long term durability.
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Thanks,this makes sense to me .