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Exhaust Valve (.3747 Inch Stem, 1.780 Inch Head, Shovelhead 1966

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Black Diamond exhaust valve, .3765 inch stem, 2.00 inch head, for Shovelhead 1966-1984.All Precision Machining, Inc., stainless steel valves are impregnated by a special German process .002 inch deep and .0002 inch surface buildup to improve wear properties and reduce friction. This process provides resistance to corrosion and wear superior to that developed by hard chromium and electroless nickel plating. These valves are light and the profiles provide excellent flow characteristics and are stellite tipped. Manufacturer