I had to make the same decision and went with a LS7. The GM crate LS7 was a few thousand dollars cheaper btw. The LSX has a few extra cubes and is bulletproof. I don't plan to make 1000+ hp and the 454 LSX's aren't making any more power than a 427 LS7. The LS7 has a lighter rotating assembly, aluminum block, dry sump, and was cheaper.
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Vic N
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