TheX1992
12-03-2002, 04:50 PM
i am getting a 11:1 high compressions piston. stock bore. no head work yet. stock valves and cam too for now. what do you think i need for octane. i am thinking 50/50 race/pump or something because of the compression. what do you think? its for a 250x so the bore is.....74mm or something like that