Production coupe/sedan is not aloud to be modified much (well in terms of body and such). Gotta have an interior.
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Production Coupe and Sedan: /PRO (Gas Only)
This category is intended to represent typical transportation vehicles which may be purchased from ANY automobile dealer. 500 examples of the model used must have been produced yearly. In keeping with this intent, the cars are aerodynamically "stone stock" with no body parts allowed which were not part of the manufacturer’s production for the series of the vehicle involved. The engine used must have been available in the model of vehicle used as purchased from ANY automobile dealer. Modified body, body panels, spoilers, air dams, etc. intended for, as accepted or sanctioned by NASCAR, NHRA, SCCA, IMSA, etc., are not permitted for use in this category unless specifically allowed. A manufacturer’s part number does not constitute an original, factory installed body part. Both exterior and interior body panels are considered to be part of a production vehicle and must be mounted in their original relationship to each other. A different displacement size of the same design engine may be used, provided it does not constitue an "Engine Swap" as defined in Section IV-12. Vehicles originally produced as a front wheel drive chassis and converted to rear wheel or four wheel drive chassis are NOT eligible for competition in the Production category. Choice of camshafts, carburetion, and ignition is unlimited. Cylinder heads are limited to original number of valves and port configuration.
It is REQUIRED that vehicles in this category that exceed 200 MPH, or if the existing record is over 200 MPH, must have roof rails.
PRODUCTION RECORDS ARE SUBJECT TO APPROVAL AND WILL BE CERTIFIED ONLY AFTER COMPARISON WITH THE MANUFACTURER’S SPECIFICATIONS FOR THE MODEL ENTERED. THE ENTRANT IS REQUIRED TO PROVIDE SUITABLE DOCUMENTATION.
XX/PRO class is limited to cylinder head port configuration as originally designed. This applies to the XXF and XXO engine classes.
Engine classes allowed are: AA, A, B, C, D, E, F, G, H, I, J, XF, XO, XXO
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PRODUCTION COUPE and SEDAN - /PRO (Gas Only )
This class is for American and foreign coupes, sedans, unaltered in height, width or contour, with all stock panels mounted in original relationship to each other. This category does not include cars properly classified as Sports or GT, such as foreign cars without rear seats suitable for continued adult occupancy. It does include Mustangs, Camaros, Barracudas, 1958 or later Thunderbirds, compacts, and other American cars of this type. There must have been 500 produced yearly. Convertible tops and rear windows must be up when running.
The following items must be retained in stock location and of the same year as the body: frame, fenders, hood, grille, drip rails (must not be filled), windows, door handles, window trim, headlights (high and low beam), tail lights, parking lights, stop lights, radiator, both bumpers and horn. Stock gas tank must be fitted, but need not be used. Any transmission, non-quick change rear end, and starter capable of starting engine may be used, so long as the original running gear design is retained.
The following body and chassis modifications may be made: headers, hood scoop, wheel openings (may be radiused), passenger and rear seat may be removed. Air dams and air spoilers identical to factory optional equipment for the body in question may be added, bucket seats may be used, original side panel upholstery or equivalent must remain, minor chrome trim and emblems may be removed.
The following are NOT permitted: streamlining, belly pans, air ducts, air vents, headlight air scoops, chopping, channeling, quick change rear ends, stepped frames, exhaust outlets through the front fenders, or hood, or body, blocked-off grilles or radiators, engine relocation, body or interior gutting, supercharging, engine swaps, taped body or window seams. Rules for this class will be strictly enforced to ensure that cars entered herein are typical of street machines which may be purchased from ANY automobile dealer.
Engine classes allowed are: AA, A, B, C, D, E, F, G, H, I and J, XF, XO & XXO.