1972 source applicability group19723 configurationsGM-102 / 250 CID source groupGM-104 / 350-400 CID source groupGM-105 / 402-454 CID source groupView model year →
1974 certified model source group19743 configurations104-2A / 350.0,400.0 CID source group104-4 / 350.0,400.0 CID source group105B / 454.0 CID source groupView model year →