sleeving the block will be necessary

With an ability to handle up to 2000 horsepower

Supertech has built a solid reputation among performance enthusiasts

Enhances performance for both stock and modified N54 setups

Every BE Bearing is hand measured

BMW S38 Valve Springs by SuperTech z4 28i sleeving the block will beSupertech delivers this high performance valve spring kit, specifically engineered for the BMW S38B35 and S38B36 engines, offering superior valve control and long lasting reliability. Each kit includes a complete set of precision crafted valve springs and all necessary installation components, ensuring a seamless fit and optimal performance. Designed for the rigors of high performance applications, Supertech valve springs are favored by performance