<b>BC0983</b> - Polaris Pro R (21-up) Stage 3 Normally Aspirated Race Spec (pair)

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Designed for modified engines. Requires BC valve spring kit, seals and guides for clearance due to high lift. Must run with aftermarket pistons with proper valve reliefs built-in. Cannot be ran with stock/OE pistons due to possible piston to valve contact. Adv Dur (.020") 265°/265° Dur @ .050 240°/240° Valve Lift (1:1) .450"/.450" Valve Lift (mm) 11.43/11.43 Show more