The 5150 valve seat kit is engineered to provide optimal compatibility with BMW S58 engines

The BMW S54 engine is a high-performance inline-six engine developed by BMW's M division

it is a MUST to drill and tap the four outer 9mm holes in the engine block to increase their size to 11mm holes

The 4119 Series maintains compliance with FIA 8855-1999 standards

BMW B58 Cylinder Head

BMW S54 Short Block Assembly Service 11127853937 The 5150 valve seat kit5150 AutoSport Short Block Build Service for BMW S54 Engines Please note that price is based on customer providing core. If you need help sourcing a core, please contact our sales team. When your BMW engine needs to be built right the first time, 5150 AutoSports Short Block Assembly Service delivers the precision, consistency, and experience demanded by high performance BMW builds. This service is performed in house by BMW focused engine builders