this valve kit enhances engine performance by delivering superior durability and reliability under demanding conditions

Unlike OEM bearings

Why Upgrade Your Valve Springs

efficiency

5150 AutoSport High Performance Main Bearing Set, BMW S55 SPRK-2521-2BM-ST this valve kit enhances engineThe 5150 High Performance Coated Main Bearing Set is designed specifically for high performance BMW S55 engines, delivering reliability and power for demanding builds. Each bearing is treated and coated by Calico, significantly reducing friction and enhancing engine efficiency. Calico's unique coating provides superior thermal resistance, making these bearings ideal for high horsepower applications, including high horsepower and racing scenarios.