PAC-1330-16 0.726 in. ID – 1.500 in. OD – 2.050 in. installed Height – 0.850 in. Max Valve Lift

0.726 in. ID – 1.500 in. OD – 2.050 in. installed Height – 0.850 in. Max Valve Lift PAC Racing’s 1300 Series Drag Race Dual Valve Spring is the manifestation of the latest technology in the drag racing valvetrain aftermarket. Traditional springs were made with higher loads and rates without concern of spring mass and frequency. PAC Racing has taken years of research and coupled that with exotic new heat treatment methods to produce the next generation of drag racing valve springs. The 1300 Series springs feature a 15-30% reduction in physical mass. This, coupled with a natural frequency increase of 20%, enables your engine to rev higher, faster, and last longer even with aggressive camshaft profiles. These springs are constructed of our signature PACaloy super clean wire and are heat-treated in-house for precise spring rates and enhanced strength. They undergo a multi-peen process to optimize service life as well. Unique to the 1300 Series, these springs then receive ID/OD chamfer finishing, a run through the polisher, and a Nano-Peen™ proprietary surface treatment to improve operating cycles. 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 ID/OD chamfer finishing Polishing to improve operating cycles Nano-Peen™ Proprietary Surface Treatment Outer Diameter – Outer Valve Spring 1.500 IN Inner Diameter – Outer Valve Spring 1.050 IN Inner Diameter – Inner Valve Spring 0.726 IN Installed Height 2.050 IN Installed Load 275 PS Open Height 1.200 IN Open Load 938 PS Open Load / Height (Valve Open) 938 LB @ 1.200 IN Valve Spring Rate 780 PS Max Coil Bind 1.130 IN Max Valve Lift 0.850 IN Recommended Valve Spring Retainer – 400 Series R408 Recommended Valve Spring Retainer – 500 Series R508, R509, R544 Recommended Valve Spring Retainer – 600 Series R608, R609, R644 Recommended Valve Spring Seat S110, S126, S134 Recommended Valve Spring Cup C202 Valve Spring Series 1300 Series Valve Spring Type Dual Valve Spring Application Drag Race Primary Market Drag Race|Street Performance