RK Autowerks S63TU4 Engine Block

DescriptionThis is a S63TU4 short block— powering the F90 M5, F91/F92/F93 M8, and F95/F96 X5M & X6M models.Our freshly machined short blocks are precision-built to OEM or performance specifications, ensuring a perfect foundation for your engine build. Each block is hot-tanked, decked, honed, and line-honed for exact tolerances. Whether you’re rebuilding for factory performance or preparing for high-boost applications, our short blocks deliver strength, precision, and long-term durability. This is just a bare block and comes with no components.