1964-1977 Fuel pump eccentric. Exact reproduction of GM #9777561. Stamped, Machined, and Heat-Treated in the USA. Critical use of 1018 Steel, Case Hardened 55-60 ( Rockwell "C") to a depth of .015". Fits all 1963 and newer Pontiac V-8 engines used in GTO/ Lemans, Firebird, and Full Size.