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Car Preparation and Specifications
2008 changes will be marked
in red
It is our preference to see cars restored to their original condition and specifications. That is to say, to the same state as when it was originally produced and raced. Racing options that were available at the time and specified for use on that particular model (homologated) are allowed.
Cars may have been raced over a number of years in various classes under an assortment of regulations. We wish to establish a clear understanding of the "point in time" (i.e., 1932, 1965, 1969) to which a car is restored. Modifications which are not in keeping with that "point in time" are not allowed. Modifications which improve performance over that of a car from that "point in time" are not allowed. Modifications such as modern valve train replacements (roller rockers, etc.), blocks, gearboxes, vented discs are not acceptable!
ENGINE: The engine must be of the original type and specifications as homologated when the car was produced. Displacement, carburation and valve train must be original in specification and material.
WHEELS: Cars must run on wheels of the same type and size as were specified by the manufacturer at the time. We refer specifically to rim width, diameter and off set as specified in the manufacturer’s homologation statement. A maximum of .5” increase in the rim width is allowed.
Wheels must be free of cracks and faults. (Have them crack tested.) Spokes must be properly tensioned. In certain instances for safety reasons the offset of wheels may be altered. Requests should be made to this office in writing. Bolt on Rudge Whitworth Spline adapters must have a paint strip indicating the adapters are secure.
Brakes: Dual master cylinders are recommended.
TIRE RULES: Tires must
approximate, as closely as possible, the dimensions of the
tires originally available on the car at the time of manufacture or the “Point
in Time to which it is restored”; this refers specifically to diameter,
cross section and tread width.
TREAD PATTERN: All tires must have a molded tread pattern
of period design, no semi-slick tread. Some classes, Historic Trans-Am, F-1,
Can-Am and selected FIA Sports Cars are exempted from this rule and may run
Slicks. (Check with event organizer)
COMPOUND: Tires must be of a manufacturers "Hard"
compound.
Note: Tire design has progressed dramatically since the early 1960s. In fact
it has been the leading field toward the development of modern racing cars.
Lower profiles and wider cross sections came into play in 1964 and it has
been constant change ever since. Tire companies that are currently making
vintage racing tires for “vintage” cars (thru 1962) are Dunlop
and Coker. The Coker tires branded “Excelsior Comp” are new and
unproven as yet. Goodyear makes a racing tire they refer to as vintage but
should not be confused with the tires they made back in the late 50s and early
60s. The current tires are considerably different in dimension even though
they may be listed as a certain size. The size indicated on the side wall
of some current tires does not mean that the dimensions of the tries are the
same as an original tire with the same listed size. These tires and tires
made by Avon are lower profile, wider and stickier. They are suited to cars
of the late 60s thru the 70s.
You should be aware that the softer, stickier compounds developed by the tire companies increase cornering loads to a point beyond the limits originally designed in to the cars and which has translated into possible suspension overload and failure.
CLASS TIRE REQUIREMENTS:
Note: There may be some individual tires that may also approximate original
tires for a specific car. These might include a 70 series radial tire. A request
to use such tires will be considered if they are truly appropriate.
Englebert tires are no longer available. Blockley tires have been well received.
CLASS B-1 1947-1955 Sports Cars (GT) C-1 1955-1960 Sports Racing Cars Under 2000cc D 1959-1965 Sports Racing Cars E-1 1955-1957 Formula I-II G-1 1955-1961 GT Cars Under 2000cc I-1 1964-1969 FIA Makes Championship Cars T-A 1966-1972 Historic Trans-Am Cars |
ACCEPTABLE
TIRE Dunlop 204/Michelin/Blockley Dunlop 204/Blockley Dunlop L or M/Goodyear Vintage Dunlop 204/Blockley Dunlop L 204/Hoosier TD Treaded Goodyear/Avon/Dunlop Goodyear Vintage 600x15 / 700x15 |
ADVERTISING ON CARS: Only historically correct markings are acceptable. Modern advertising is not allowed.
CAR RACE NUMBERS: All event numbers will be assigned by the organizer. Numbers should be 2" - 3" in width and 14" - 15" in height
PRESENTATION: Cars must be presented in a neat and finished condition. Engine compartment, suspension, chassis and drive line must be clean enough to facilitate inspection. Cables, wires and noses must be taped or otherwise secured to prevent chafing, etc.
BODY: Body modifications from original such as contemporary flares, spoilers, and air dams will not be accepted.
Additional Rules Pertaining to Production Car
Classes:
G-1, G-2: 1955-1962
G-3, G-4: 1962-1965
Interior: Modifications
to the interior that reduce the weight of the car are not allowed, with the
following exceptions: 1) Floor mats or rugs may be removed. 2) Window glass
may be removed from doors.
The removal of interior trim (gutting) is not permitted.
The cars must have 2 seats (original and/or period bucket seats is allowed),
original dash board (you may exchange or add instruments), interior door panels.
Installed safety equipment may not have any influence whatever on the mechanical
performance of the car.
Exterior:
1) Tops may be removed from open cars.
2) Bumpers may be removed, but if so, all projecting hardware such as brackets
must also be removed.
3) Grills may not be removed.
4) Windshields may be replaced by a suitable windscreen.
5) Lighting equipment must remain in place.
6) Headlights should be taped.
Brakes:
Must be of the original type and specifications as homologated when the car
was produced.
Engines:
Must be original as previously stated in the general rules. Modern valve train
replacements such as roller rockers, titanium valves, etc. are not allowed.
Dry sump systems that were not originally fitted to the specific car are not
allowed. Headers are allowed.
Transmission & Differential:
Must be of the original type, as produced. Gears and ratios as originally
offered.
Minimum Weight:
The minimum weight allowed is that listed in the SCCA Rule Book, Production
Car Specifications, 1962 for G-1 & G-2 and 1965 for G-3 & G-4, less
7%.
