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.
| Part# | PAC-1281X |
| Alt Part# | PAC-1281X-16 |
| Description | 1200 RPM Series Coyote Ovate Wire Beehive Valve Springs |
| Outside Diameter ) | Top 0.849″ / Bottom 1.031″ |
| ID Large End (Bottom) | .709″ |
| ID Small End (Top) | .527″ |
| Install Height | 1.811″ |
| Load at Installed Height | 80 PS |
| Spring Open Height | 1.260″ |
| Spring Open Load | 214 PS |
| Recommended Valve Lift | .551″ |
| Spring Rate (lbs/in) | 245 PS |
| Coil Bind (max) | 1.208″ |
Recommended Valve Spring Retainer – 300 Series – R364
Recommended Valve Spring Retainer – 400 Series – R464



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