Supertech Black Nitride coated Stainless Steel intake valves are excellent for your high HP VG30DE(TT) build. 

Supertech stainless steel intake valves are manufactured from an enhanced version of EV8 (21-4N) steel. This material was chosen specifically because it’s the highest grade of steel available and provides the strength to withstand just about any application.  Our stainless steel valves are one piece forged valves, and depending on the application feature hardened tips, hardened seats, swirl polish, undercut, and our black nitride coating.

Black Nitride

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).
• Higher rpm's engines take full advantage of all previous features. The higher the engine speed the bigger the power loss due to internal engine friction! The black nitride layer reduces this power loss due to less valve-guide  friction.
• The nitrided layer is adhered to the base material at a microscopic level, so does not "flake" or break when the valves bend due to impacts with the pistons.
• The Black Nitride applies to the whole valve while the chrome coating is only applied to the stem.
• All valves are swirl polished, have stem undercut and a hardened tip.

• Specifications:

HEAD DIAM: 34.50mm (+0.5)
STEM DIAM: 5.97mm
LENGTH: 103.15mm
MATERIAL: Black Nitrided
VALVE TYPE: Intake

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