The timing spline ensures the timing chain stays taut

M6x40mm (x2)

designed for the S54 inline-six engine

maintaining durability and performance under extreme load conditions

Inner wheel wells do not need to be modified with tire diameter up to 635mm (215/45R17

B46 CNC Cylinder Head Porting 20-0749-FL The timing spline ensures the5150 AutoSport 5 Axis CNC Cylinder Head Porting for BMW B46 Engines Please note that price is based on customer providing disassembled, clean core. If you need help sourcing a core, please contact our sales team. Also note that this service includes a 1 2 week turnaround time for service completion, beginning when the 5150 Team receives your head. Investing in cylinder head porting for your high performance BMW engine enhances airflow efficiency for