BMW M20 Short Block Assembly Service

5150 AutoSport Short Block Build Service for BMW M20 Engines Please note that price is based on customer providing core. If you need help sourcing a core, please contact our sales team. When your BMW engine needs to be built right the first time, 5150 AutoSport’s Short Block Assembly Service delivers the precision, consistency, and experience demanded by high-performance BMW builds. This service is performed in-house by BMW-focused engine builders using professional machine shop equipment and strict measurement standards. Whether you’re preparing for forced induction, track use, or a high-power street build, our short block assembly process is designed to provide a strong, reliable foundation for your engine. Each short block begins with a customer-supplied core, which is thoroughly cleaned and machined before precision assembly. Every critical clearance is measured, verified, and set to specification—no shortcuts, no guesswork. Short Block Assembly Service Includes: Hot tank cleaning Cylinder boring Cylinder honing Deck resurfacing Line honing of main journals Precision balancing of the rotating assembly File-fit piston rings Piston and connecting rod assembly Main bearing clearance Rod bearing clearance Final short block assembly Important Service Details: Labor only — components are not included Customer must supply a usable engine core Final pricing depends on core condition, component selection, and build requirements 5150 AutoSport is trusted by BMW owners worldwide for professional engine machining and assembly services. From stock rebuilds to high-horsepower performance engines, our short block assemblies are built to handle the demands of modern BMW performance applications. If you’re searching for a BMW engine builder who understands precision machining, proper clearances, and real-world performance, this short block assembly service is the foundation your build deserves.