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I've been thinking of a similar swap to replace my 915's. How much of a performance gain are you expecting red? Are you also going with a large can?

All I have ever seen for hyper's was 5500+, so who knows.

I think it's piston speed(feet per minute) = (stroke*rpm) ÷ 6 And for cast pistons it should stay below 3500fpm and forged should stay below 5500 for rule of thumb. I guess this assumes your valve train is up to the chore as well.