Supertech Inconel Exhaust Valve – Toyota 1JZGTE | Single | TEVI-1008

Supertech TEVI-1008 Inconel exhaust valve for the Toyota 1JZGTE inline-6 engine. Sold as a single valve — the 1JZGTE is a 6-cylinder engine with one exhaust valve per cylinder; order 6 for a complete full-engine valve replacement. 0.14 lbs per valve.

Inconel Exhaust Valve

Inconel is a nickel-chromium superalloy engineered for extreme high-temperature and high-oxidation environments. Exhaust valves operate in the most thermally demanding area of the engine — exposed to hot exhaust gases at temperatures that exceed the safe operating range of standard stainless steel valves in high-boost or high-RPM applications. Inconel valves maintain their mechanical properties and resist oxidation and heat erosion at temperatures where stainless steel valves begin to deform, pit, or fail prematurely.

For a stock or mildly modified 1JZGTE, OEM-spec stainless valves are adequate. For high-boost builds — particularly those running upgraded turbos, E85, or sustained high-load operation — Inconel exhaust valves are the correct choice for long-term reliability and engine longevity. Inconel valves are standard specification in professional motorsport and are the go-to upgrade for any serious 1JZ build targeting high power levels.

Supertech

Supertech Performance manufactures engine valves, valve springs, retainers, and related components to OEM and motorsport tolerances. Their valves are widely used by engine builders in the 1JZ/2JZ, Honda K/B series, and other performance platforms for consistent dimensional accuracy and material quality.

1JZGTE Applications

The 1JZGTE 2.5L inline-6 twin-turbo (and later single sequential turbo) was used in the following Toyota platforms:

• Toyota Mark II / Chaser / Cresta — JZX90 (1992–1996)
• Toyota Mark II / Chaser / Cresta — JZX100 (1996–2001)
• Toyota Mark II / Verossa — JZX110 (2001–2004)
• Toyota Supra — JZZ30 (1990–1996, 1JZ variant)

Sold as a single valve. Order 6 for a complete 1JZGTE exhaust valve set (1 per cylinder). Verify valve dimensions (stem diameter, head diameter, overall length) against your specific 1JZGTE variant before ordering to confirm TEVI-1008 is correct for your application. Supertech valves require installation by a qualified engine builder — valve-to-guide clearance, seat cutting, and spring selection must be verified for the specific build.

Specifications

• Brand: Supertech
• Part Number: TEVI-1008
• Material: Inconel superalloy
• Type: Exhaust valve
• Quantity: Single (order 6 for full set)
• Weight: 0.14 lbs per valve
• Application: Toyota 1JZGTE — all variants