PAC Racing 1400 Series Conical Valve Spring
Top 0.650 in. / Bottom 0.943 in. ID – Top 1.012 in. / Bottom 1.305 in. OD – 1.800 in. installed Height – 0.670 in. Max Valve Lift
Your Price: $25.61
SKU: PAC-1421
In Stock
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PAC Racing’s Conical Valve Springs have continuously varying diameters from the top of the spring to the bottom. This provides another spring option that continuously varies the loads and natural frequencies to control the engine’s valvetrain. Of course, they are constructed from our signature PACaloy super clean wire. The small diameter at the top required much smaller low-mass retainers for lightweight valvetrains. The bottom of the spring has lower rate damping coils that reduce coil surging and dampen resonant frequencies from aggressive valvetrains or RPM shifts
- Refined surface with multiple stage shot peening
- Small diameter top section requires smaller low mass retainers for lighter weight valvetrains
- Continuously variable diameters and pitch provide variable load and natrual frequencies
- Bottom of the spring has lower rate damping coils that reduce coil surging and dampen resonant frequencies from aggressive valvetrains or high-RPM shifts
GTIN: 00193564530974
| Outer Diameter – Outer Valve Spring | Top 1.012 IN / Bottom 1.305 IN |
|---|---|
| Inner Diameter – Outer Valve Spring | Top 0.650 IN / Bottom 0.943 IN |
| Installed Height | 1.800 IN |
| Installed Load | 150 PS |
| Open Height | 1.170 IN |
| Open Load | 425 PS |
| Open Load / Height (Valve Open) | 425 LB @ 1.170 IN |
| Valve Spring Rate | 437 PS |
| Max Coil Bind | 1.047 IN |
| Max Valve Lift | 0.670 IN |
| Recommended Valve Spring Retainer – 300 Series | R310, R311, R363 |
| Recommended Valve Spring Retainer – 500 Series | R510, R511 |
| Valve Spring Series | 1400 Series |
| Valve Spring Type | Conical |
| Primary Market | Drag Race|Street Performance |