SKU: TIVN-1018x12_TEVN-1018x8
Supertech Valves Set Toyota 4AGE 20V +1mm Oversize FOR Toyota Corolla AE86

Black Nitride Coated Supertech Performance Dished Face Valves. 

This set will work in any Toyota 4age 20v engine, they are +1mm Oversize for your high flowing cylinder head application.

Only the best materials are used in the creation of Supertech Performance's valves.  Ready to handle whatever abuse you can throw at them.  Perfect for forced induction applications and high revving naturally aspirated applications.

This is for a complete set of 20 valves (12 intake & 8 exhaust)

Part # TIVN-1018 -- intake x 12

Intake Valve Specs -- 27.5mm Head Diameter, 4.96mm Stem Diameter, 98.6mm Length

Part # TEVN-1018 -- exhaust x 8

Exhaust Valve Specs -- 27.00mm 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 nitrated 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 nitrated layer, lasting longer with lead free fuels, alcohols, nitro or other "explosive" mixes. Mathes 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 nitrated 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.

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