Stage 4 RZR Head rzr Offset fin on both water

Offset fin on both water and air sides of the core for rapid heat transfer

meticulously performed by our expert technicians in multiple phases

and turbo upgrades

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

For those seeking even greater performance gains

Stage 4 RZR Head rzr Offset fin on both waterStage 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