MAHLE 54579A Black Diamond 20mm Head Gasket – 2006-2007 Ford 6.0L Powerstroke

Seal your late-model 6.0L Powerstroke the right way with the MAHLE 54579A Black Diamond 20mm Head Gasket. This premium multi-layer steel (MLS) gasket is engineered for the higher demands of the 6.0L and features MAHLE’s advanced Black Diamond coating for superior sealing, reduced friction, and long-term reliability under towing, daily driving, or moderate performance use.

Key Features

• Multi-layer steel (MLS) construction (5 stainless steel layers)
• Black Diamond fluoroelastomer coating for improved cold sealing and better conformity to imperfect surfaces
• Designed specifically for 20mm cylinder head alignment dowels
• Includes (1) head gasket + (2) 20mm cylinder head dowel pins
• Sold individually — quantity of 2 required per engine

Fitment Notes

• 2006.5–2007 Ford 6.0L Powerstroke (F-250/F-350/F-450/F-550 and E-Series where equipped with 20mm dowels)
• Fits engines with serial numbers #299093 and after / #3723722 and after
• 20mm alignment dowels were used on engines manufactured January 12, 2006 and newer
• Early 6.0L engines (2003 through January 11, 2006) use 18mm dowels — confirm your dowel size before ordering
• Always verify dowel size when using remanufactured cylinder heads (most OE Ford heads are 20mm regardless of build date)

Cross References

• Ford: 6C3Z-6051-A, 6C3Z-6051-AA
• Navistar: 1850307C1

A high-quality direct replacement that meets or exceeds OE sealing performance. Pair with new head bolts or quality head studs for best results.