Supertech Performance BMIVN-1033SL-12 Black Nitrided Intake Valve Set BMW S50B32 +0.65mm Oversize

These valves feature a +0.65mm oversize head diameter (35.65mm) for improved airflow and performance in modified cylinder heads.

Key Features:

• One-piece forged construction from EV8 (21-4N) stainless steel for superior strength and reliability
• Black nitride hardening treatment provides smoother surface finish than chrome coating and reduces friction between stem and guide
• Patented Superfinishing process on valve stem reduces surface roughness by up to 66% compared to chrome coated valves
• Single groove design with 5.97mm stem diameter and 121.30mm overall length (oversize)
• Valve tips hardened beyond 52 HRc for extended durability
• Precision CNC machined through multiple stages with strict dimensional tolerances for optimal sealing and performance
• Optimized valve head angles including back cut and under cut for maximum flow rates

Specifications:

• Material: Stainless Steel 21-4N (EV8)
• Head Diameter: 35.65mm (+0.65mm oversize)
• Stem Diameter: 5.97mm
• Overall Length: 121.30mm
• Groove Type: Single Groove
• Treatment: Black Nitrided with Superfinish

Supertech applies over 30 years of manufacturing experience and state-of-the-art quality control including ultrasonic testing, x-ray inspection, laser measurement, and Finite Element Analysis (FEA) to ensure industry-leading performance and durability. Each valve undergoes additional heat treatment for stress relief followed by specialized nitride hardening treatment to maximize fatigue resistance and tensile strength.