Ok here i go....I have a 1989 warrior with the white bros r-4 exhaust, ported, mikuni 38...i think. Well at any rate when i went to install exhaust I tightened up head pipe bolts and yep broke em both, took head off (could not get em drilled out on machine, you know how that works) I So I figure I best to cam it while it's out, and possibly resleeve and piston it. I'm not sure about going bigger without stroking but more compression wouldn't be the worst thing, any suggestions would be great.