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Message: <blockquote data-quote="IceMan" data-source="post: 843962" data-attributes="member: 8832"><p>306 is .030 over. To be honest with you, if your goal is 450 rwhp than you don't really need forged pistons. The 306 will not add too much power over stock unless you bump the compression but than its not good to run a turbo on that motor. Building a motor if your stock one is still good is a waste of money. Stock cam is great for turbo, and if you plan to put a turbo on it than you don't need a "built" motor. I'm just trying to save you money. If you want to build a motor, than use an aftermarket block. Don't use the weak stock block. Use a Dart, R302, Boss block, but not stock. Stroke it to a 331, put a good set of heads and intake, custom cam, that 76mm turbo and make 700+ RWHP and drive it on the street. Don't waste your money building a stock block. It's just not worth it, and it's a waste of money. Use the stock 5.0L motor until you have enough money to build an aftermarket block one. 450 RWHP is very easy to get on a stock motor with a turbo.</p></blockquote><p></p>