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Inverted dome utilizes radius tooling to eliminate hot spots. Symmetrical valve reliefs for universal installation. Valve reliefs cut for oversized valves and most street/strip camshafts. Lower ring lands and thicker crown for increased durability. High silicon alloy for tighter piston to wall clearance. Can be used in small blower and nitrous applications. .927'' x 2.750'' x .150'' straight wall carbon steel wristpin (130g) included. 1/16, 1/16, 3/16'' ring grooves.