08/14/2026
Someone spent $29,000 building this S58. It has never been started.
Not one revolution under power. Zero miles — turned by hand on the stand during assembly, then shelved when the project behind it died. It’s finished, it’s documented, and it’s been sitting.
What’s in it: — Darton sleeved S58 block — Esse Werks fire-ringed / O-ringed deck — CP-Carrillo 84.25mm forged pistons, HD wrist pins — Carrillo Pro-H connecting rods — ARP 625+ oversized head studs, timeserted — Esse Werks Stage 3 5-axis CNC-ported head — Esse Werks copper alloy valve seats — GSC valves, springs, Ti retainers — GSC S2 camshafts — 284°/288° adv, 240°/242° @ .040”, 10.2 / 10.8mm lift — Copper head gasket, 9.3:1 — New genuine BMW DI injectors, lifters, oil pump — Balanced, blueprinted, assembled
Hardware window is 800–1400 whp across 4,500–8,500 rpm. Build the turbo and the fueling around it and it will hold what you ask of it.
Configured for xDrive G80 M3 / G82 M4 — oil pan and pickup are chassis-specific. RWD M3/M4, X3 M and X4 M: confirm pan and pickup for your application first. Swap guys — this is a complete long block, pan to valve cover, and it’s a clean starting point.
Not included: turbos, fuel system, charge piping, exhaust manifolds, sensors and wiring, accessory drive, ECU. Bring your bolt-ons and your calibration.
Documented build cost is over $29,000 in parts and machine work. It’s listed at $18,995. There is one. When it sells, the listing comes down.
Engine is on a stand m in storage. Freight is $450 to the lower 48.
Full spec sheet available to serious buyers, listed on our website - link in bio. Fitment questions in the comments or DMs.
