4.0-Liter BMW S38B35 High-Performance Engine – Fully Rebuilt by The Power Plant, Greensboro NC

This BMW S38B35 inline-six engine, originally developed for the BMW M5 (E28/E34) and M6 (E24), has been expertly rebuilt and enlarged to 4.0 liters by Henry Lawrence of The Power Plant in Greensboro, North Carolina. Acquired by the current owner approximately one year ago, this high-performance unit has been custom-built for motorsport or restomod applications and has zero running hours since completion.

The legendary BMW S38 engine, known for its robust cast-iron block, aluminum 24-valve head, and dual overhead camshafts, has been elevated to modern racing specifications through a comprehensive rebuild using premium forged internals and precision machining. Every component has been optimized for durability, high-rev capability, and superior oil management under extreme conditions.

This build increases displacement to 4.0 liters with a custom billet crankshaft, Wiseco forged pistons, and Crower connecting rods. Performance upgrades include Supertech racing valve springs, custom high-lift camshafts, and adjustable cam gears for exact timing control. The addition of a billet dry-sump oil pan ensures optimal lubrication for continuous high-load operation, making this engine ideal for competitive or enthusiast-level builds.

Perfect for BMW M5, M6, or custom racing and restomod projects, this S38 delivers the best of BMW’s motorsport heritage with cutting-edge performance refinement.

Technical Specifications

• Engine Code: BMW S38B35 (Modified to 4.0L Specification)

• Displacement: 4.0 liters (Expanded from 3.5L)

• Configuration: Inline-six (I6)

• Bore x Stroke: 95 mm x 94.5 mm

• Block Material: Cast Iron

• Cylinder Head Material: Aluminum Alloy

• Valvetrain: DOHC – 24 valves (4 per cylinder)

• Compression Ratio: Estimated ~11.0:1 (depending on piston setup)

• Fuel System: Multi-point Electronic Injection (ECU-ready)

• Ignition System: Coil-on-Plug Compatible

• Lubrication: Billet Dry-Sump Oil Pan Conversion

• Builder: Henry Lawrence – The Power Plant, Greensboro NC

• Condition: Fresh rebuild, 0 miles since assembly

Performance & Internal Components

• Custom Billet Steel Crankshaft (94.5mm stroke)

• Crower Forged Connecting Rods

• Wiseco 95mm Forged Pistons, Rings, and Pins

• Supertech Racing Valve Springs and Retainers

• Custom Racing Camshafts (13.2mm intake lift / 12.5mm exhaust lift)

• Oversized Valves: 39mm Intake / 33mm Exhaust

• Adjustable Camshaft Gears

• Custom Timing Chain Sprocket and Dual-Row Timing Chain

• MLS Multi-Layer Steel Head Gaskets

• Billet Dry-Sump Oil Pan Assembly

• Ported Cylinder Head for optimized airflow

• Balanced Rotating Assembly for high-RPM operation

Compatibility

• BMW M5 (E28, E34)

• BMW M6 (E24)

• Custom race builds, restomods, or BMW conversions

• Suitable for track, endurance, and performance applications

Condition

• Professionally rebuilt and blueprinted

• Zero runtime since completion

• Stored in a climate-controlled facility

• Turn-key ready for installation in your project