Manley Oval Track Chrome Silicone Double w Damper 16pc Valve Springs 1.550 OD Kremp Flowers: Elevate Your Space with Stunning Arrangements. 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 and minimize valve float under extreme load, they help keep your engine responsive and controlled when it matters most Designed for oval track and drag racing Chrome silicon material