You can spin them 6k but they will last a lot longer at 5700. I do have 1.36 gears. I think the motors are good or 400 hours beore rebuild and 150 beore valve springs

what size?

what power are you running I need porps also still running my old 32 lab 4 blades motors still need more run time before I take it up there

525 EFI. trying to figure out if 5 blades are faster than 6 blades. also trying to figure out the target RPM for highest speed. I see some at 4800 doing 90 but it must be with 32 6 blades. I have 30's 6 blade. I have been up to 85 @5100 with more to get. getting up there slowly

I have regular P5's on my Top Gun with Konrads. Slip a bit getting on plane, but once it is on plane I love them!! I've gone 88 @ 5200 and still had plenty of throttle left!!