Harley Davidson Knucklehead Engine 1937 - 1940 some of the external characteristics of those years are the tin covers around the Rocker, the shaved Cam cover and the oil lines that forms this loop shape and pressure gage attach to the oil pump
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Harley Davidson Knucklehead Engine 1937 - 1940 some of the external characteristics of those years are the tin covers around the Rocker, the shaved Cam cover and the oil lines that forms this loop shape and pressure gage attach to the oil pump
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