Mahle 54450A Black Diamond 18mm Head Gasket for 6.0L Powerstroke

Reseal your 2003–2006 Ford 6.0L Powerstroke with the Mahle 54450A Black Diamond 18mm cylinder head gasket. This premium multi-layer steel (MLS) gasket uses five stainless steel layers and Mahle’s Black Diamond coating (a proprietary fluoroelastomer) for superior sealing on uneven or pitted surfaces, better clamp-load retention, and long-term reliability under high cylinder pressures.

Key Features

• Multi-layered steel (MLS) construction with Black Diamond coating
• Includes (2) 18mm cylinder head dowel pins
• Approx. 0.059–0.060" (1.52 mm) thickness
• 3.83" (97.40 mm) bore
• Drop-in replacement compatible with factory or stock-sized aftermarket head studs/bolts
• Sold individually (order quantity 2 for a complete engine)

Fitment Notes Designed for 2003–early 2006 6.0L Powerstroke engines with 18mm alignment dowels (typically engines manufactured through January 11, 2006; serial number range commonly cited as ~137745–299092). Always verify your actual dowel size before ordering—many remanufactured heads and later production engines use 20mm dowels. Most Ford OE heads are 20mm regardless of build date.