Cylinder Heads
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The cylinder heads are cast aluminum and include pressed-in-place powdered metal valve guides, 56 mm (2.20 in) diameter titanium intake valves, 41 mm (1.61 in) diameter sodium filled stem exhaust valves, and 70 cubic centimeter combustion chambers. Passages for the engine coolant air bleed system are at the front of each cylinder head. The valve rocker arm covers are retained to the cylinder heads by 4 center mounted rocker arm cover bolts.