Stage 4 RZR Head rzr 406" Valve Lift (mm) 10

406" Valve Lift (mm) 10

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

and turbo upgrades

96 magnets per weight kit

this is a must have for your next build if planned on increased power levels

Stage 4 RZR Head rzr 406" Valve Lift (mm) 10Stage 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