Several materials are available:

STAINLESS STEEL:
Made of one piece forged valve for higher strength and reliability. Use of EV8 (21-4N) for intake and exhaust valves.

BLACK NITRIDE (Coating) The micro-hardness is higher than the stainless steel base material, keeping good ductility beneath the hard nitrided layer (micro-hardness 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). --- 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 brake 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

Chrome (special coating used only as noted) Widely used and known in high performance valves Only applied to stem.

NICKEL 751
This nickel base alloy material is used for exhaust valves in engines that reach very high temperatures and its use is growing with applications for forced induction.

TITANIUM:
One piece forged high temperature Titanium alloy. yellow Titanium Nitride and Chrome coating.

INCONEL:
(special valve material used only as noted) Inconel 751/Nimonic - These Nickel based alloy materials are used for Exhaust valves in engines that reach very high temperatures and its use is growing with the application of turbos and superchargers.

Please contact us for your size and material. Many different sizes for various applications available: Honda, Nissan, Toyota, Subaru, Mitsubishi, etc...