ZRP Std Intake Valves Black Nitride for BMW 3.0L B58

BMW 3.0L B58 – ZRP Standard Black Nitride Intake Valves (Set of 12)

ZRP Standard Black Nitride Intake Valves are engineered for the BMW 3.0L B58B30 inline-six engine, including applications such as M2, M140i, M240i, and other 3.0L 24v platforms (F30, G20, E90). Designed for high-performance street builds as well as single and twin-turbocharged applications, these intake valves deliver exceptional durability, dimensional stability, and consistent performance under high boost and high-RPM conditions.

Manufactured from one-piece forged high-grade stainless steel (EV8 / 21-4N), each valve undergoes a specialized black nitriding process. This advanced surface hardening treatment diffuses nitrogen into the outer layer of the valve, significantly increasing wear resistance and fatigue strength while reducing friction between the valve stem and guide due to the smoother, hardened surface.

Unlike localized chrome coatings, the entire valve — including both stem and head — receives the black nitrided treatment. This ensures uniform surface protection, improved resistance to abrasion and valve seat recession, and extended service life in modern high-output turbocharged engines.

Each valve is precision forged, CNC-machined, polished, and tip hardened to meet strict dimensional tolerances. This guarantees accurate valve seating, stable high-RPM operation, and consistent sealing performance in both naturally aspirated and turbocharged configurations.

Technical Features

• Base Material: High-grade stainless steel (EV8 / 21-4N)

• Surface Hardness: Nitrided layer up to approx. 800 HV

• Manufacturing Process: Precision forged, CNC-machined, polished, and tip hardened

• Treatment Coverage: Full black nitriding of stem and valve head

• Dimensional Accuracy: Tight tolerances for concentricity, straightness, and sealing surface finish

Advantages

• Reduced stem-to-guide friction for lower wear

• Improved stability at high RPM and high boost

• Longer service life compared to untreated stainless-steel valves

• Reliable sealing in naturally aspirated and turbocharged engines

• Suitable for high-performance street, track, and endurance racing applications

Additional Information

• Set Quantity: 12 valves

• Material: Black Nitride

• Valve Size: 30.10 mm / 4.96 mm / 99.50 mm

• Engine Code: B58B30

• Application: BMW 3.0L M2, M140i, M240i; 3.0L 24v F30, G20, E90 (Single & Twin Turbo)