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