Brand New Supertech Performance Black Nitride Dished Face Valves for the Toyota AE86 4AGE 20v Silver Top & Black Top Engines

Only the best materials are used in the creation of Supertech Performance valves, ready to handle whatever abuse you can throw at them.

Complete Set of 20 Valves (12 Intake and 8 Exhaust Valves)

Supertech Part # TIVN-1018 - Intake - 1mm Oversize - 27.50mm - Dished Face

Intake Valve Specs - 27.50mm Head Diameter - 4.98mm Stem Diameter - 98.6mm Length

Supertech Part # TEVN-1018 - Exhaust - 1mm  Oversize - 27mm - Dished Face

Exhaust Valve Specs - 27mm Head Diameter - 4.97mm Stem Diameter - 108.40mm Length

  • Benefits for Black Nitride Coating includes:

  • - The micro hardness is higher than the stainless steel base material, keeping good ductility beneath the hard nitride layer (micro hardness is 800hv minimum)

  • - Surface finish is smoother than with chromed valve stems, having less friction between the stem and guide.

  • - Valve seat surface is harder with the nitride 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 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 nitride layer is adhered to the base material at microscopic level, so it will 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, a hardened tip, and more.

    • Please ask any questions you may have prior to bidding. We offer a full line of high performance auto parts.