what pistons ..stock have a bore size of 85 or 86mm
what cranks swap into the m42 to allow a bigger stroke.....
Im in the process of building a m42 for fun and need some info on the quick.
Ill post pics here soon.
P.s No need to ever port a m42 it flows the same ported or not. Had one flow tested today. Just do a 3 angle grind on the valves and you will be good to go.