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the guys who know the info you are talking about dont shair it -- as you already know the motor size the cam duration and valve size all play -- as small a change like back cutting the underside of the valve head would thro off the game - and can only be checked on a bench machine at .000 to.100 lift - matching the parts in full on racing porgram like you guys do bigger is more power always -- of course to a point the computor programs give it a good stab but will never match real time -- the only way i was able to figu out what the V Twin wanted in port loacation and size is with fuel dye in the gas and real time racing than tear it down and feness the ports it got us their but it took an entire season of racing in small steps that turned into a #1 plate -- but it was time and very hard -- jz
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