RPM Series Dual Valve Springs, 1.274" OD

The PAC Racing Springs PAC-1238X RPM 1200 Series Racing Dual Valve Springs are engineered for demanding, high-performance engine builds. As part of the RPM Series, these dual valve springs are specifically optimized for aggressive valvetrains and are built to withstand high-lift, abusive applications. They are designed to work with most aftermarket cylinder heads requiring 1.274″ diameter dual springs and camshafts with lifts up to .750″. Constructed with a 1.274″ outside diameter, these springs offer a 600 lbs./in. spring rate and a coil bind height of .985″. The inner spring features a .630″ ID, while the outer spring has a .900″ ID. The product is described as a RACE ONLY Spring, indicating its intended use in competition or extreme performance scenarios. The set includes 16 springs. Key specifications include an installed height of 1.800″ with a load of 250 lbs, a spring open height of 1.050″, and a spring open load of 700 lbs. The recommended maximum valve lift is .750″.