1968 Corvette Belts (Big Block) Year Description GM # Quanta # 1968 Generator, 427, w/o PS, w/o AC 3861950 29-B-110 1968 Generator, 427, w/ PS 3878243 29-B-111 1968 Generator, 427, w/o PS, w/ AC 3940991 29-B-112 1968 Water Pump, 427, w/o AC, Before 3/68, (1st Design) 3935420 29-B-113A 1968 Water Pump, 427, w/o AC, After 3/68, (2nd Design) 3889374 29-B-113B 1968 Water Pump, 427, w/ AC 3940990 29-B-114 1968 Power Steering, 427 3940992 29-B-115 1968 Air Conditioning, 427 3921905 29-B-116 1968 A.I.R. Pump, 427, w/o AC 3850962 29-B-117 1968 A.I.R. Pump, 427, w/ AC 3921905 29-B-118