I just found the answer to my thread, the following cars may have had aluminum brake drums: 80-84 LeSabre, 78-81 Century, 78-87 Regal, 81-85 Riv, 82-92 Camaro, 86-89 Impala, 78-81 Malibu, 78-88 Monte, 80-85 Delta 88, 78-82 Cutlass, 80-81 & 83-85 Bonneville, 86 Parisienne, 82-92 Firebird, 78-85 Lemans. The weight savings is about 5 lbs per drum, 1/4 mile ET reduction approx .02 and .2 mph gain. Every little bit helps, happy hunting.