Supertech BMW S38 Black Nitrided Exhaust Valve - +1mm Oversize - Set of 12

This set includes 12 Supertech black nitrided exhaust valves, each measuring 1mm oversize for your BMW S38 engine. These valves are a key component for rebuilding or upgrading your engine's top end, directly impacting how efficiently your engine breathes. The +1mm oversize design allows for a larger valve head, which can improve airflow into the combustion chamber, potentially leading to better performance. The black nitriding treatment on these valves is a surface hardening process that increases wear resistance and durability, helping them withstand the high temperatures and stresses found in the exhaust port.

When you're working on the cylinder head, replacing or upgrading your valves is a critical step. These Supertech valves are well-built and designed to handle the demands of performance engines. The nitriding process not only makes them tougher but also gives them a distinct look. Installing these oversize valves means you'll be working with a larger sealing surface in the cylinder head, so ensuring the head is properly prepared for the larger valve diameter is important for a good seal and optimal performance.

If you're rebuilding your S38 engine and looking for reliable exhaust valves, this set of 12 offers a solid option. They are designed to fit the S38 engine and the +1mm oversize specification is noted for those looking to maximize airflow. Always refer to your engine's service manual for specific installation procedures and recommended clearances.