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
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Top 0.650 in. / Bottom 0.885 in. ID – Top 1.072 in. / Bottom 1.307 in. OD – 1.880 in. installed Height – 0.660 in. Max Valve Lift
Top 0.650 in. / Bottom 0.885 in. ID – Top 1.072 in. / Bottom 1.307 in. OD – 1.880 in. installed Height – 0.660 in. Max Valve Lift
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
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
Top 0.650 in. / Bottom 0.930 in. ID – Top 1.050 in. / Bottom 1.330 in. OD – 1.900 in. installed Height – 0.670 in. Max Valve Lift
Top 0.650 in. / Bottom 0.930 in. ID – Top 1.050 in. / Bottom 1.330 in. OD – 1.900 in. installed Height – 0.670 in. Max Valve Lift
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