Supertech BMW S65/S85 30.5x 4.95 x 110.2mm Inconel Exhaust Valve - Set of 16

If you're rebuilding the top end of your BMW S65 or S85 engine, these Supertech Inconel exhaust valves are a solid choice for handling extreme heat. These are specifically designed for those high-performance V8 and V10 engines found in models like the E90 M3 and E60 M5, where exhaust temperatures can get very high. Using Inconel, a superalloy known for its exceptional heat and corrosion resistance, these valves are built to last under demanding conditions.

The material choice here is key. Inconel can withstand temperatures well over 1500°F (815°C), which is crucial for exhaust valves that are constantly exposed to combustion gases. This high-nickel, high-chromium alloy also offers excellent strength at elevated temperatures, meaning the valves are less likely to warp or fail when your engine is pushed hard. Each valve measures 30.5mm in diameter with a 4.95mm stem and a 110.2mm overall length, ensuring they fit precisely within the valve guides and seat correctly. This set includes all 16 valves needed for a complete engine rebuild.

When installing these, it's important to ensure your valve guides and valve seats are in excellent condition to match the quality of these valves. Proper valve seating is critical for sealing and performance, especially with high-performance engines. These Supertech valves are a direct replacement for the stock units, simplifying the installation process for a mechanic or experienced DIYer.