Offered here is the Black and Decker Valve and Valve Seat Tool Specification Manual. It is a 32 pages and has specifications such as Valve Seat angle, Pilot / Guide Size (with proper part number of pilot to use), and tells what Valve seat Stone size to use. Cover engines up to 1952. Covers Passenger Cars, Motorcycles, Trucks and Busses, Tractors, Combines, Road Machinery, Gas and Diesel Marine Engines, and Aircraft Engines