1968 NASCAR International Stock Car Racing Rule Book NASCAR Grand National Championship Circuit Section 20-1 -- Competing Models

America's greatest auto race drivers competing with the finest equipment developed by America's automotive manufacturers. Not more than two Grand National Championship Circuit races will be sanctioned at any track in one season without special permission from the National Stock Car Racing Commission.

a. NASCAR Grand National races are open to steel bodied 1966, 1967, 1968 models of American-made passenger car production sedans, available to the general public, classified as follows: Standard and Intermediate.

The specifications for the Grand National Division, in essentially the same form as listed here, have been accepted by the Automobile Competition Club of the United States -- FIA and by the FIA for inclusion in the Apendix J. They will be listed in Category 5B of the special touring sedan section.

Category 1--Standard size cars.

Limited to cars with a minimum of 119-inch wheelbase, a maximum engine size of 430 cubic inches piston displacement, standard body size and complying with minimum weight requirement as set forth in paragraph 1b. (OVERBORING: A total maximum of one cubic inch will be permitted for overboring because of cylinder wear).

The following 1968 cars have been classified in Category 1--

The following 1967 cars have been classified in Category 1--

The following 1966 cars have been classified in Category 1--

Category 2--Intermediate size cars.

Limited to cars with a minimum of 115-inch wheelbase, and less than 119-inch wheel base, a maximum engine size of 430 cubic inches piston displacement, standard body size and complying with minimum weight requirement as set forth in paragraph 1b. (OVERBORING: A total maximum of one cubic inch will be permitted for overboring because of cylinder wear).

The following 1968 cars have been classified in Category 2--

The following 1967 cars have been classified in Category 2--

The following 1966 cars have been classified in Category 2--

Category 3--Compact or GT Cars. (Not eligible in this division)

Limited to cars with a wheelbase of less than 115 inches, with a maximum engine size of 335 cubic inches piston displacement.

Category 4--Sports cars. (Not eligible in this division)

Category 5--Grand Touring cars. (Not eligible in this division)

b. Minimum weight Category 1 and Category 2 cars.

9.36 lbs. per cubic inch of piston displacement, with gas, oil and water, ready for racing without driver, with an absolute minimum of 3,650 pounds for all cars.

c. Eligibility.

(1) It is mandatory that a street version engine be produced by the manufacturer as a regular production option for installation and sale to the public in a regular product offering, and that 500 of the type car and engine must be titled, pursuant to bonafide consumer transactions, before it will be eligible for competition.

(2) Production models and production engines introduced by January 1, 1968, will be classified eligible for competition in 1968. New models or engines introduced after January 1, 1968, will not be eligible for competition until April 15, 1968. Any equipment introduced after April 15 will not be eligible during 1968.

(3) The ACCUS car classification committee will determine if the eligibility requirements have been met.

(4) All eligible engines can be used in the standard size (Category 1) or the intermediate size (Category 2) cars.

(5) There will be no weight or displacement handicap on any car or engine in 1968.

(6) Maximum engine displacement for Category 1 and Category 2 cars is 430 cubic inches, with a total maximum of one cubic inch permitted for overboring becasue of cylinder wear.

(7) All model, engine or equipment changes or modifications not governed by NASCAR rules Section 20 c (1), (2) and (3) must be submitted for consideration of approval, not less than 30 days prior to the date of intended usage in NASCAR competition. The applicant will be notified of approval or rejection no less than 15 days before the date of intended use. Any equipment which does not conform to specifications or tolerances contained in the NASCAR Rule Book, will not be eligible for approval during 1968.

No changes from standard production automobiles or component parts will be permitted except as specified in following specifications: