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X4 Quattro Bolt locking mechanism
Comes standard with a pad and a plain steel insert
- The crankshaft is the heart of the endothermic engine
Features 6" of 60 degree tungsten carbide
RACING VALVE SPRING KIT 15-6191 X4 Quattro Bolt locking mechanismKPMI valve springs are wound from Premium Kobe Super Clean Chrome Silicon Wire. KPMI valve springs are heat treated, stress relieved, and shot peened to insure maximum performance and life. Springs are engineered for each specific application using proprietary advanced spring design simulation, and analysis software. Engineers pay special attention to cam and spring harmonics, stress, mass, and operating rpm. 80 Lbs of Seat Pressure 205 Lbs @ 0. 435"
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