433 lb/in Valve Spring, 1.304-Inch OD

The PAC Racing RPM Series valve spring is a high-performance dual-spring set engineered for GM LS-series engines, including the LS1, LS2, LS3, LS4, LS6, L76, L92, L99, LQ4, LQ9, L33, and LSA. These round-wire springs are built to handle aggressive camshaft profiles, offering a recommended valve lift of up to 0.700 inches. With a spring rate of 433 lb/in and a coil bind height of 1.000 inches, they are designed to maintain valvetrain stability under the extreme demands of racing. Each set includes 16 springs with an installed height of 1.800 inches and a load of 155 lbs at that height. The open load is rated at 436 lbs at an open height of 1.150 inches. PAC Racing utilizes advanced metallurgy and in-house heat-treatment processes to ensure fatigue resistance and durability. Due to the high-performance nature of these springs, professional installation and proper valvetrain geometry verification are recommended to ensure optimal performance and engine longevity.