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Message: <blockquote data-quote="IceMan" data-source="post: 826971" data-attributes="member: 8832"><p>Well, here is the deal. Do you wanna be safe??? Than keep it about 500 RWHP and under 6000 RPM. A lot of people think that the horsepower is what kills the block. That is somewhat true but most importantly is the RPM's is what kills it. You can have a 450 RWHP car that you rev up to 7000 and the block will fail you faster than a 550 RWHP car that you rev up to 5500 RPM. Is the car going to be N/A or with a power adder??? N/A is going to be hard to make 500 RWHP without high RPM on a 347.</p></blockquote><p></p>