Vitesse 6 1600 2 Litre 1962-71 with AC Delco ignition. GT6 Mk1, Mk2, Mk3 1966-75 with AC Delco ignition. Spitfire Mk1, Mk 2 Mk 3 Mk 4 1962-75 with AC Delco ignition. Triumph 4 & 6 cylinder engine fitted with AC Delco ignition ( not for Lucas equipped engines).