Product Description
MAHLE 54579A Black Diamond™ 20mm head gasket for the Ford 6.0L Powerstroke delivers OE-level sealing with multi-layer steel (MLS) construction and MAHLE’s Black Diamond coating. Sold individually (order two per engine) and includes two 20 mm cylinder head dowel pins for correct alignment.
- Construction: Multi-Layer Steel (MLS) with Black Diamond coating
- Dowel size: 20 mm (verify before ordering)
- Includes: (1) head gasket, (2) 20 mm dowel pins
- Warranty: 1-Year Limited
Fitment
- 2006.5–2007 Ford F-250/F-350/F-450/F-550 6.0L Powerstroke (20 mm dowels; fits engine serial #299093 & after / #3723722 & after)
- Also used on 2004–2010 Ford E-Series 6.0L Powerstroke where equipped with 20 mm dowels
- Note: Early 6.0L engines (2003 to Jan 11, 2006) use 18 mm dowels—confirm head/dowel size, especially on reman heads.
Cross Reference Numbers
- Ford: 6C3Z-6051-A, 6C3Z-6051-AA
- Navistar: 1850307C1
- GTIN/UPC: 027067878380
FAQ
Do I need one or two gaskets?
This is sold individually—order two if you’re servicing both cylinder heads.
How do I know if I have 20 mm dowels?
Ford switched to 20 mm on January 12, 2006 (engine serial # thresholds above). Measure dowels or verify casting/serials before purchase.
Does this include head bolts or studs?
No—bolts/studs are sold separately. Pair with quality fasteners during reassembly.
Will it work with reman heads?
Yes, but confirm dowel size on reman heads; most Ford OE heads are 20 mm regardless of build date.
