I have screwed up my engine (not sure what the problem is yet) i was wondering how big you can bore out the cylinder before it becomes more of a hassle than a benefit?
I haven't assessed them for what they'll take but they are under-valved so there will only be an increased torque benefit and the top end will be the same.
I can cross reference a piston or two but you should leave as was. if you phuqed up one: do you trust yourself with another?