Kyushin

Im am installing a new OEM short block from honda and since i have an AP1, I want to go with an AP2 short block with the AP1 head. I know its a direct drop in and fully compatable, but im curious as to what is the safest max rpm I can set it to for safe engine life. I have seen some say 8400 and others claim 9k is safe, while others say the piston wall pressure would be too great at 9k.

My goal with the ap2 short block is increased power over all and I will be keeping the same SC setup, so looks like ill lose 1 psi up top.

What is the concensus on the max safe rpm for a ap2 bottom and ap1 head?

JUSTINTHECOASTIE

8.6k should be fine as limit with fuel cut @8.5k, however Termination will argue 9k ALL DAY

S2KIrishman

id rev it to 9k...but thats me