McLaren 650s engine
McLaren 650S involves sourcing the M838T power plant. This 3.8-liter twin-turbo V8 is the heart of the McLaren Super Series and is known for its incredible power-to-weight ratio and flat-plane crank sound.
Engine Specifications: M838T
The 650S engine is an evolution of the 12C unit, featuring several internal upgrades to achieve the 650 PS (641 hp) output.
| Feature | Details |
| Configuration | 90° V8, Twin-Turbocharged |
| Displacement | 3,799 cc (3.8L) |
| Bore x Stroke | 93 mm x 69.9 mm |
| Valvetrain | DOHC, 4 valves per cylinder |
| Lubrication | Dry Sump (Essential for high-G cornering) |
| Redline | 8,500 RPM |
Buying & Sourcing Intelligence
Sourcing a complete engine assembly typically happens through high-end exotic recyclers or specialized McLaren workshops.
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“Long Block” vs. “Complete Assembly”:
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A Long Block includes the block, heads, and internals.
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A Complete Assembly (or “Turnkey”) includes turbos, manifolds, wiring loom, and sometimes the AC compressor/alternator.
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Compatibility: While the 12C and 650S use the “same” M838T block, the 650S features new cylinder heads, pistons, and a different cooling calibration. Do not attempt to swap a 12C engine into a 650S without knowing these technical differences.
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