1989-1993 Mazda Miata Black Nitride Intake Valve by Supertech
Supertech intake valves are made exclusively from an enhanced versions of EV8 (21-4N) steel. This is the highest grade of steel available and provides the strength to withstand just about any application.
Features
- Head Diam: 32.00mm (+1.0)
- Material: Stainless Steel 21-4N
- Groove Type: Single Groove
- Length: 105.35mm
- Stem Diam: 5.96mm
- Back-cut angle
- Undercut stem
- One piece forged valve (non-magnetic)
- Magnetic friction welded wafer, Hardened to 52 HRC min
- Black Nitride for superior hardness keeping core ductility
- “Superfinish” valve stem with a surface roughness of about 1/3 of a regular valve
Benefits
- Less Friction
- Better Flow Rates
- Better Sealing
- Improves durability and reduces carbon build up
