Jerry Hall would be my recommendation...His dune motor is like 70h.p. with T5s, stock cylinders, stock modified head & stock modified carbs running on 100LL. Purdy sweet my buddies rig was killing extended bikes at the drags last year on a stock wheelbase bike. It ran great!! My bike comes on just a tad earlier (mx port).. But where mine signs off his just keeps on going, and going, and going.... tons of overrev. It was bulletproof all last season too. He's got a dyno, and has been porting for a very long time. I would like to buy some flea-bay jugs and have him port them for me very soon. I was happy with my porting until I rode his bike..