PAC Racing 1400 Series Conical Valve Spring Set

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