Ideal for street/strip and oval track applications. Symmetrical valve reliefs for universal installation. Wide ring lands and thicker crown for increased durability. High silicon alloy for tighter piston to wall clearence. Will work with small nitrous systems. .927'' x 2.750'' x .150'' straight wall carbon steel wristpin (130g) included. 1/16, 1/16, 3/16'' ring grooves.