Manley Oval/Drag Chrome Silicone Double w/ Damper 16pc Valve Springs 1.550 OD/.725 ID The Manley Professional Series Valve Springs are engineered for serious performance builders and racers who demand reliable high RPM control and long lasting durability. Built from premium chrome silicon and H 11 tool steels with precision heat treatment and shot peening, these springs deliver robust tension and fatigue resistance across demanding applications ranging from oval track to the drag strip. Designed to maintain consistent spring pressure
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