SuperTech Black Nitride Exhaust + Intake Valves For Subaru EJ20 & EJ25 Turbo For Sale - New and Used

SuperTech Black Nitride Exhaust + Intake Valves For Subaru EJ20 & EJ25 Turbo
Part #SIVN-1014-8 + SEVN-1014-2-8
SuperTech Fitment

• Subaru - EJ25 Turbo DOHC
• Subaru - EJ20 Turbo DOHC

SuperTech Details

• SEVN-1014-2-8
• Head Diam: 33.00mm(+1.0)
• Material: Stainless Steel 23-8N
• Groove Type: Single Groove
• Length: 104.20mm(-0.5)
• Stem Diam: style=\"\">Head Diam: 37.00mm(+1)
• Material: Stainless Steel 21-4N
• Groove Type: Single Groove
• Length: 104.35mm(std0
• Stem Diam: 5.96mm

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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