Ferrea Valve Spring Kit – BMW M50

Built for extreme conditions

making them a trusted upgrade for both street and track applications

Installing ARP head studs can provide several benefits

Please note that engine bearings are non-returnable

S55 Cylinder Head Service by 5150 AutoSport Service:Pro-Xtreme Ferrea Valve Spring Kit –5150 AutoSport Performance Cylinder Head Services for BMW S55 Engines Please note that price is based on customer providing core. If you need help sourcing a core, please contact our sales team. Investing in a performance cylinder head service is crucial for optimizing engine potential in performance builds. We offer three levels of service to meet your budget and build goals, from OEM refresh to full race level machining: Stage 1 OEM Refresh (Rebuild