It was the final year of the Camel's sponsorship of the prototype class, and the final year of the GTP and GTP Lights prototype categories before they were replaced with the World Sports Car (WSC) class of prototypes the following year.
Non-GTP prototypes raced at the 24 Hours of Daytona under this class.
GTO cars ran as part of the GTS class in endurance races.
A class for ACO-spec GT cars was introduced for the Road America and Laguna Seca races, but no cars appeared at Laguna Seca.
[1] Rocky Moran Mark Dismore Frank Jellinek Tim McAdam Jim Downing Robby Gordon Wally Dallenbach Jr. Robbie Buhl Al Bacon Peter Uria Mike Mees Ruggero Melgrati Andy Wallace Dan Marvin Ruggero Melgrati Johnny O'Connell John Morton Al Bacon Peter Uria Mike Mees Dan Marvin Dan Marvin Dan Marvin Bob Schader "John Winter" Dan Marvin Dan Marvin Bob Schader Bob Schader [2] Bold - Pole position Italics - Fastest lap WSC cars were counted as part of the GTP class for points standings.