[jmz]

Originally Posted by faapgar

The D-shape exhaust ports work well.Ports are not too big.For another 20 ft.lbs.of torque from 4-5,000 rpm take down the center of the piston crown a few mm,s the width of the exhaust valve.You drop your C.R. a little but it will rev quicker to redline and increase mid range torque.The less the air climbs the mountain peak of the crown the quicker it flows through the exhaust valve.Fred

Somone also spent a lot of time making the pistons light... Not sure if there is enough meat to take down the crowns.