ok, wich engine would you put in a rusty? i know the wasp is a straight drop in, but is the o.s?

your going to have to screw it in...

alright the most powerful smallblock WAS the .18CVRX but that was beaten by the O.S. .18 TM/TZ, the wasp was fast when it came out, now the CVRX would run circles around it

I don't know if the O.S. is a drop-in engine for your rusty but I would recommend. I have several friends who own O.S. engines and they love them. I'm thinking about getting one myself.

ok, thanks for the replys, but does anyone know if the os will drop right in like the wasp?

Yes, it will.
assuming you get the correct crankshaft configuration. I THINK the Rusty is a long-shaft engine, but don't hold me to it.

ok thank, and the rusty is the short shaft