Supertech
Supertech Inconel Exhaust Valve Kit Fits Nissan Skyline R32 R33 R34 GTR RB26DETT - Head 30.15mm x12 (OE) Length 101.2mm
Made as a one piece forged valve for higher strength and reliability, Supertech use mostly EV8 (21-4N) for Intake and Exhaust valves but there are other alloys that we use along with different heat treatments to manufacture valves for different applications.
Black Nitriding:
This is a hardening treatment that even though it is not widely used as the chrome coating, it has several benefits and is becoming very popular, mainly for European and Japanese applications.
The microhardness is higher than the stainless steel base material, keeping good ductility beneath the hard nitrided layer (microhardness is 800HV minimum). Surface finish is smoother than with chromed stems, having less friction between stem and guide.
Valve seat surface is harder with the nitrided layer, lasting longer with lead free fuels, alcohols, nitro or other "explosive" mixes. Matches any kind of seats (nodular iron seats, steel powder metal seats, hard aluminum-copper seats or beryllium copper seats).
Related Performance Parts
Supertech
SuperTech Valve Springs Fits Nissan Skyline R33 GTST RB25 83lb Dual Valve Springs Retainers Kit for RB25DET w/ Solid Lifter Conversion
SKU: SPRK-TS1015/RB25
Supertech
SuperTech Valve Springs Fits Nissan Skyline R32 R33 R34 GTR RB26 92lb Dual Valve Springs Retainers Kit
SKU: SPRK-TS1015/RB26
Supertech
Supertech Inconel Exhaust Valve Kit Fits Nissan Skyline R32 R33 R34 GTR RB26DETT - 102.7mm (tip+1.5mm) x12
SKU: NEVI-1032/7-L-12
Supertech