Stage 4 RZR Head rzr A must for upgrading your

A must for upgrading your AMG M157's engine and pairs with any Darton MID Sleeved Block

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96 magnets per weight kit

For those seeking even greater performance gains

Stage 4 RZR Head rzr A must for upgrading yourStage 4 Big Valve REQUIRES CORE CYLINDER HEAD CNC Ported Runners & Chambers Bronze valve guides honed to precise tolerances Performance Newen 5 Angle Radius Valve seat profiles Surfaced to single digit Ra's Assembled and blueprinted Hardware Included: BC Intake and Exhaust (inconel) Valves BC Beehive Spring kit with chromoly retainers New Valve Seals New Valve Locks