PAC-1209X-16 0.680 in. ID – 1.324 in. OD – 1.800 in. installed Height – 0.750 in. Max Valve Lift

0.680 in. ID – 1.324 in. OD – 1.800 in. installed Height – 0.750 in. Max Valve Lift PAC Racing’s Street Performance RPM Series Dual Valve Springs are constructed using our signature PACaloy super clean wire and are heat-treated in-house for precision spring rates and improved strength. They also receive a multi-peen process, polishing, and a Nano-Peen™ proprietary surface treatment for service life optimization. Applications include GM Gen III/IV LS, Ford 2V and 4V Mod Motors, Ford Coyote, Big Block Chevy, Ford 5.4L GT500 & Cobra Jet, Chrysler 6.4L Gen III Hemi, GM Gen IV LS7, and Ford Godzilla 7.3L. Built using our signature PACaloy super clean wire to ensure strength and durability In-house heat-treating for precise spring rates and increased strength Multi-peen process to optimize service life Polishing to improve operating cycles Nano-Peen™ proprietary surface treatment Outer Diameter – Outer Valve Spring 1.324 IN Inner Diameter – Outer Valve Spring 0.950 IN Inner Diameter – Inner Valve Spring 0.680 IN Installed Height 1.800 IN Installed Load / Height (Valve Closed) 160 LB @ 1.800 IN Open Height 1.100 IN Open Load 510 PS Open Load / Height (Valve Open) 510 LB @ 1.100 IN Valve Spring Rate 500 PS Max Coil Bind 1.000 IN Max Valve Lift 0.750 IN Recommended Valve Spring Retainer – 300 Series R335 Recommended Valve Spring Retainer – 400 Series R435, R450 Recommended Valve Spring Retainer – 500 Series R550 Recommended Valve Spring Retainer – 600 Series R635, R650 Recommended Valve Spring Seat S129, S135, S136 Valve Spring Series RPM Series Valve Spring Type Dual Primary Market Circle Track|Street Performance