Mechanics & Owners Guide to 1941-1959 Harley-Davidson O.H.V. Big Twins

The knuckle & panhead motors of today benefit from advances in technology. Modern replica knuckle cylinder heads now have the later 1954-1965 O-ring intake manifold, that eliminates the troublesome (leaking) large-hex "plumber nuts" of 1936-1953. Over the last 35 years the aftermarket Harley parts for the 1936-64 OHV Big Twin motors have leveled-off into less choice, but higher quality. The 1954-57 rigid frames that will be returning to market, all have fixtures welded or brazed for the immediate fastening of parts to frame.