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It will be an amazing package when its done. With a 4.5 stroke, you will need a 4.570 bore to achieve 590. whos pistons and rings are you using? I havent seen a build of that size (not that I am an expert) Im in the process of collecting parts for an aluminum 598. 4.500 stroke with a 4.600 bore. What heads will you be using? With an aftermarket aluminum head, it should make north of 750 hp no problem.
Jason
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