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PAC Racing RPM Series Dual Valve Spring Set – GM Gen III/IV LS
0.655 in. ID – 1.280 in. OD – 1.800 in. installed Height – 0.700 in. Max Valve Lift
Your Price: $404.53
SKU: PAC-1222X-16
In Stock
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PAC Racing’s 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. These springs fit GM Gen III/IV LS engines with specific part numbers for stock heads and aftermarket heads.
- 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
GTIN: 00193564531643
| Outer Diameter – Outer Valve Spring | 1.280 IN |
|---|---|
| Inner Diameter – Outer Valve Spring | 0.925 IN |
| Inner Diameter – Inner Valve Spring | 0.655 IN |
| Installed Height | 1.800 IN |
| Installed Load / Height (Valve Closed) | 180 LB @ 1.800 IN |
| Open Height | 1.100 IN |
| Open Load | 480 PS |
| Open Load / Height (Valve Open) | 480 LB @ 1.100 IN |
| Valve Spring Rate | 425 PS |
| Max Coil Bind | 1.055 IN |
| Max Valve Lift | 0.700 IN |
| Recommended Valve Spring Retainer – 300 Series | R355 |
| Recommended Valve Spring Retainer – 400 Series | R455 |
| Recommended Valve Spring Retainer – 600 Series | R655 |
| Recommended Valve Spring Seat | S121 |
| Valve Spring Series | RPM Series |
| Valve Spring Type | Dual |
| Primary Market | Circle Track|Street Performance |