The Small Block Chevy (SBC) originally designed as a 265CI engine by Ed Cole for Chevrolet first appeared in the 1955 model year Corvette and has been made in several displacements ranging from the 265, 283, 305, 327, 350 and many others all the way up to 400 cubic inches. A form of the SBC was available in just about every division of General Motors at some point. They all share the same basic architecture and several parts thus helping to reduce GM’s production costs. The LT & LS superseded the SBC in the 90’s and GM finally discontinued the motor in 2003. There have been over 100 million SBC motors built since 1955.