what he calls match porting is lightly porting the cyllinders....like he knife edges the intakes...where its like a flat block behind the carbs.....i live in michigan and the riding i do is mostly pleasure riding.....but i do also run 1/4 mile flat track......im not sue of the elevation here.....
i got the .040 piston kit for a lil over 100.00 so thats why i bought it....couldnt touch one local for less then 195.00
and with the +4 timing i was told i have to run race gas to prevent detonation.......
thanx for the input guys