The Excalibur entered production in 1965 after initially debuting a prototype back in 1963. The first generation of the Excalibur is known as the Series I and often referred to as the SI. These cars were initially built in a two seat convertible roadster body style, but soon after a two door, four seat phaeton debuted. Power for these cars came from a Corvette-sourced 327ci V8 engine that generated 300hp. Drive was sent to the rear wheels through a manual or automatic transmission. Production of the Series I Excalibur lasted until 1969, after which it was replaced by the Series II Excalibur.