Add to Cart Quick view Power Valve Spring Kit MSRP: Now: $47.00 Was: Three different spring rates to choose from in the kit. Springs fit all Piston and Bellow style Supreme exhaust valve assemblies. Gives the option of fine tuning the opening rpm of your valves...
Add to Cart Quick view Power Valve Nylon Spring Spacer Set of 6 MSRP: Now: $4.00 Was: Spring Shims for all STM power valves that do not have the cap with the red adjuster nut
