Book excerpt: Harley-Davidson Knucklehead, Panhead, and Flathead motorcycles are among the most collectable American motorcycles. How to Restore Your Harley-Davidson is a complete guide to correctly restoring these models to factory-original specification. Author and Harley-Davidson expert Bruce Palmer III has packed 1200 pages with more than 1200 photographs, detailed descriptions, specification charts, and tables covering: *VIN, motor, and frame numbers *Frame, chassis, and bodywork restoration *Motor, transmission, clutch, wheel, brake, carburetor, and exhaust system restoration *Paint color codes and plating finish for every nut and bolt *Electrical ignition and lighting components *Accessories and options. How to Restore Your Harley-Davidson is the essential reference for restoring these classic machines, an encyclopedia telling you which parts are correct and which are not. This two-volume book set covers 1936-1947 Knucklehead, 1948-1965 Panhead, 1937-1948 Big Twin Flathead, and 1937-1965 45c.i. (750cc) Flathead models.