I'm putting together a little T-6 pylon racer and was given an OS Max 25 engine. I understand it needs to be the non-BB type (bushing) for competition. I'm having a heck of a time trying to it the engine. It's stamped with the following:

OS Max (on cylinder left side)
25 (on cylinder right)
KP (under right mounting tab)
2607 (on case plug)

I've tried the OS site - no help. So here I am. Thanks for any help!

Chuck Gould