M20 Supertech Valve Set

Supertech stainless steel valves for the M20 engine — engineered for higher heat tolerance and longer service life than OE. Available in standard and +1mm oversize.

Standard:

EV8/21-4N stainless steel with black nitride coating — reliable sealing, smoother operation, and long service life suited for street performance, track days, and moderate boost applications.

• 42mm intake — black nitride coated
• 36mm exhaust — black nitride coated
• Replaces BMW part numbers 11341287814 & 11341706631

+1mm Oversize:

Inconel exhaust valves withstand sustained extreme temps that stainless cannot — the choice for high boost and high-output builds demanding increased airflow. Intake remains black nitride coated.

• 43mm intake — black nitride coated
• 37mm exhaust — Inconel alloy
• Requires additional cylinder head machining

The only valve set we trust in every M20 885 cylinder head we build at BimmerHeads.