The gas engines that we are concerned with are the water cooled motors. The history of the water cooled engines starts back in 1974 with the Mark I cars. Those original gas motors grew size and evolved in technology. By the 1990’s the fuel injection and ignition had become complicated in design yet simple in execution. Our treatise on gas engines starts with these engines as the flow of technology forward is important. There are separate pages on each of the motors that we work on. Now starts the pages devoted to the engines in the cars we love and work on.