January 28, 2011 at 3:40 PM #1 When was the switch from 3939S to 4201S ?mikeEdited by - mcfly on 01/28/2011 15:41:48Edited by - SixT5HiPo on 01/28/2011 23:30:17
January 28, 2011 at 4:38 PM Official Post #2 The 1966 model year was the changeover of the two pumps. The only exception is the 66 Shelby GT350 carryover cars as they were actually built as 1965 units.-Fred-