M21 Marine Cooling Head

Specs:

• 1.5mm lower than the O.S. original marine head
• Aproximately 40% larger water cooling volume compared to the original O.S. marine head
• M5 Stanless Steel Nipples
• Diameter: 39.7mm
• Height: 12mm
• Weight: 20.4g (including nipples)

Fits:

• M-Works O.S.Speed 3.5cc Marine Engines
• O.S. R21 Engines