Supertech BMW M3 S54 Black Nitrided Intake Valve - Set of 12

Supertech intake valves are made exclusively from enhanced versions of EV8 (21-4N) steel, the highest grade of steel available. Features include a 35.00mm head diameter, stainless steel 21-4N material, single groove type, 117.38mm length, 5.97mm stem diameter, back-cut angle, undercut stem, one-piece forged valve (non-magnetic), magnetic friction welded wafer hardened to 52 HRC min, and black nitride for superior hardness while retaining core ductility. The 'Superfinish' valve stem has a surface roughness of about 1/3 of a regular valve. Benefits include less friction, better flow rates, better sealing, improved durability, and reduced carbon build-up.