The Ferrea B38 Valve Spring Kit is engineered to eliminate three of the most common causes of engine failure in performance builds: binding

BMW E32 735i Automatic with 3

The timing spline ensures the timing chain stays taut

Our commitment to minimizing harmonics and optimizing engine performance spans the entire BMW lineup

Raw aluminum finish or Black

B46 CNC Cylinder Head Porting 20-0749-FL The Ferrea B38 Valve Spring5150 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