BMW S58 3.4L Stroker Kit by 5150 AutoSport

Overview

A complete stroker kit for BMW S58 engines featuring a 5150 4340 billet steel crankshaft, CP-Carrillo Pro-Xtreme forged pistons, Manley Performance and CP-Carrillo connecting rods, and premium internals. Available in 84mm (3325cc) and 85mm (3404cc) displacement options with multiple compression ratios (9:1 to 12:1). Includes skirt-coated pistons for reduced friction and improved reliability under high-stress conditions. Requires professional engine builder for block clearancing.

Installation summary

Installing the BMW S58 3.4L Stroker Kit by 5150 AutoSport is an expert-level engine build requiring specialized machine shop equipment, precision measuring tools, and an estimated twenty hours of dedicated labor. Because this complete rotating assembly demands meticulous block clearancing for the 4340 billet steel crankshaft and forged pistons, it is strictly suited for experienced engine builders rather than typical DIY mechanics. The most critical step during the process is verifying exact bearing clearances and checking piston-to-valve tolerances across your chosen compression ratio and displacement configuration. Due to the extreme precision and machining required to build a reliable high-stress S58 engine, professional installation by a qualified engine specialist is strongly recommended.

AI-generated overview — always verify against the official install instructions.