Spool Performance Darton Sleeved M178 Engine Block

Mercedes-AMG M178 Darton Sleeved Block

The factory Mercedes-AMG M178 aluminum block was never designed for the cylinder pressures seen in today’s high-boost, high-power applications. When pushing the limits of the platform, proper cylinder support becomes non-negotiable. Our M178 Darton Sleeving Machining Service transforms the stock block into a foundation capable of handling extreme horsepower reliably.

This service involves precision machining and installation of Darton ductile iron sleeves, providing vastly improved cylinder strength, distortion control, and long-term durability under high boost and elevated combustion loads.

Each block is CNC-machined, sleeved, and finish-honed to within ±0.0001", ensuring exceptional bore geometry, ring seal, and piston stability—critical for both high RPM and high cylinder pressure operation.

What’s Included

• Precision machining of the M178 aluminum block

• Professional installation of Darton sleeves

• Final torque-plate honing to ±0.0001" tolerance

• Ready for custom piston fitment and high-power assembly

Why Darton Sleeves?

• Dramatically increased cylinder strength

• Improved resistance to bore distortion

• Superior ring seal under high boost

• Essential for big-power and race-level M178 builds

Important Notes

• This is a machining service only — no engine block is included

• You may supply your own M178 block or we can assist with sourcing one

• Pistons, assembly, and short-block build are not included unless quoted separately

If you’re planning a serious M178 build and want a block that can handle the abuse, this is the starting point.