I never said it was a big difference, but there is a difference. And if he's going to run stock rods and 400 WHP he's walking a very fine line and will need all the help he can get to increase reliability. Even if that means sticking with the centrifugal instead of a twin screw. Unless he's planning on spending most of the time at the rev limiter it's not the rpm's that will kill the rods first. If rev's are the cause of rod failure it's more than likely it's because of over revving, not hitting red line momentarily.
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