The original Cavaliers were available as two and four-door saloons, and with a two-door booted (three-box) coupé body as used for the Opel Manta. The cars came with a choice of 1.6 and 1.9 L inline four cylinder Opel CIH engines in the saloon: only the 1.9 L engine was available in the coupé. Vauxhall engineers built Cavalier prototypes using the 2.3 L Vauxhall Slant-4 engine, for use in a future high-performance variant, but the proposals did not get past GM Europe management, and as a result the larger-engined Cavaliers were exclusively powered by the Opel CIH engine.