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Originally Posted by Rob. Smith
A modified LS1 LSX Chev motor is just as illegal as a 427 side oiler.
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I don't agree. A stroked LSX could be made legal quite easily. They are externally the same as an LS1 so there is no visual clue that the block is different apart from a coat of paint over the iron. The eficient cylinder head design will give it half a chance of meeting the emissions requirements with the right tune in there. The dirty heads on the 427 FE won't have a chance. The LSX would be running the complete factory EFI system and could be tuned to clean up the emissions to a legal level.
Cheers