Supertech Performance HEVI-1020D Inconel Exhaust Valve 30mm Dished STD

The Supertech Performance HEVI-1020D is a precision-engineered Inconel exhaust valve designed for high-performance and forced-induction engine builds. Manufactured to a standard dished head diameter of 30.00mm with a 5.45mm stem diameter and overall length of 108.65mm, this exhaust valve delivers the dimensional accuracy and material properties demanded by serious engine builders.

Constructed from Inconel 751 nickel-base superalloy, the HEVI-1020D is specifically engineered for exhaust applications that generate extreme heat. Inconel offers superior high-temperature strength, excellent oxidation and corrosion resistance, and outstanding creep resistance under sustained elevated exhaust gas temperatures — making it the preferred choice over stainless steel in turbocharged, supercharged, and endurance racing applications.

Key Features:

• Inconel Superalloy Construction — Maintains strength and sealing integrity under prolonged boost conditions and repeated heat cycles where stainless steel valves may degrade
• 30.00mm Dished Head (STD) — Precision-ground seat face and dished profile for repeatable, stable sealing and optimized flow geometry
• 5.45mm Stem Diameter — Controlled stem finish ensures consistent stem-to-guide clearance and long guide life
• 108.65mm Overall Length — Standard OEM replacement length for direct fitment in compatible cylinder heads
• Chrome Stem Coating — Applied to the valve stem for reduced friction and improved durability in the valve guide
• Single Groove Retainer Design — Compatible with standard performance valve springs and retainers
• Sold Per Valve — Order the quantity that matches your engine's valve count (e.g., order 8 for a full exhaust set on a 4-cylinder engine)

Supertech recommends pairing these valves with matching Supertech valve springs and retainers sized for your camshaft profile. Proper seat cutting, stem-to-guide clearance verification, and piston-to-valve clearance checks are required during installation. The HEVI-1020D is an ideal upgrade for builds that see sustained high exhaust gas temperatures, extended track sessions, or significant boost pressure.