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Originally Posted by TravisB
not sure who built the 427 LSx but 550 is mild for one of those. Considering for bascially no extra money you can build more cubes with an LSx up to almost 500ci I believe. There are several companies out there building 427-440ci LSx engines that make well into the 600hp range up to 700hp in some cases depending on cam and heads. Durability of the LSx block has to be better than the aluminum block.
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I think it was the new PHR, or Super Chevy. You'll see it advertised at the very top.
Ty