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NHRA GAS CLASS STRUCTURE BY YEAR 1958-1969 |
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1958 |
1959 |
1960 |
1961 |
1962 |
1963 |
1964 |
1965 |
1966 |
1967 |
1968 |
1969 |
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Non-Supercharged Classes |
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A/Gas |
0 - 8.99 |
0 - 8.99 |
0 - 8.99 |
4.00 - 8.99 |
5.00 - 8.99 |
6.00 - 8.99 |
6.00 - 8.99 |
6.00 - 8.99 |
6.00 - 6.99 |
6.00 - 6.99 |
5.00 - 6.49 |
5.00 - 6.49 |
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B/Gas |
9.00 - 10.99 |
9.00 - 10.99 |
9.00 - 10.99 |
9.00 - 10.99 |
9.00 - 10.99 |
9.00 - 10.99 |
9.00 - 10.49 |
9.00 - 10.49 |
7.00 - 8.99 |
7.00 - 8.99 |
6.50 - 7.99 |
6.50 - 7.99 |
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C/Gas |
11.00 - 12.99 |
11.00 - 12.99 |
11.00 - 12.99 |
11.00 - 12.99 |
11.00 - 12.99 |
11.00 - 12.99 |
10.50 - 11.49 |
10.50 - 11.49 |
9.00 - 10.99 |
9.00 - 10.99 |
8.00 - 9.49 |
8.00 - 9.49 |
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D/Gas |
13.00 - 13.99 |
13.00 - 13.99 |
13.00 - 13.99 |
13.00 - 13.99 |
13.00 - 13.99 |
13.00 - 13.99 |
11.50 - 12.99 |
11.50 - 12.99 |
11.00 - 12.99 |
11.00 - 12.99 |
9.50 - 10.99 |
9.50 - 10.99 |
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E/Gas |
14.00 + |
14.00 + |
14.00 + |
14.00 + |
14.00 + |
14.00 + |
13.00 - 14.59 |
13.00 - 14.59 |
13.00 - 14.59 |
13.00 - 14.59 |
11.00 - 12.49 |
11.00 - 12.49 |
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F/Gas |
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14.6 + |
14.6 + |
14.6 + |
14.6 + |
12.50 - 13.99 |
12.50 + |
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A/GA |
Automatic Transmissions |
0 - 8.99 |
0 - 8.99 |
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B/GA |
9.00 - 10.99 |
9.00 - 10.99 |
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C/GA |
11.00 - 12.99 |
11.00 - 12.99 |
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G/Gas |
Non-supercharged pre-1960 flathead V-8's, in-line 6-cylinder and
straight eight engines with stock production type heads and
pre-1960 4-cylinders with any type head |
5.00 - 10.99 |
5.00 - 10.99 |
5.00 - 10.99 |
5.00 + |
14.00 + |
6.00 - 7.99 |
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H/Gas |
11.00 + |
11.00 + |
11.00 + |
11.00 + |
6.00 - 8.99 |
8.00 - 10.99 |
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I/Gas |
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9.00 - 11.99 |
11.00 + |
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J/Gas |
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12.00 + |
10.00 + |
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K/Gas |
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10.00 + |
Dropped |
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Supercharged Classes |
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A/GS |
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0 - 8.59 |
4.00 - 8.59 |
5.00 - 8.99 |
6.00 - 8.99 |
6.00 - 8.99 |
6.00 - 8.99 |
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B/GS |
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8.60 - 10.59 |
8.60 - 10.59 |
9.00 - 12.59 |
9.00 - 12.59 |
9.00 - 12.59 |
9.00 - 12.59 |
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C/GS |
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11.00 + |
11.00 + |
12.60 + |
12.60 + |
12.60 + |
12.60 + |
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AA/G |
All numbers shown reflect the lbs/engine
cubic inch ratio as calculated for each car.
Example
3600 lb. car with a 350 cubic engine in 1962 would race B/Gas.
Ratio calculated to 10.29 lbs/engine cubic inch.
(3600/350). |
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6.00 - 8.99 |
5.00 - 7.99 |
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BB/G |
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9.00 - 11.99 |
8.00 - 10.99 |
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CC/G |
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12.00 + |
11.00 + |
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AA/GS |
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5.00 - 7.99 |
6.00 - 8.99 |
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BB/GS |
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8.00 - 10.99 |
8.00 - 9.49 |
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CC/GS |
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11.00 + |
10.00 + |
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1958: Minimum Wheelbase 86 inches; Chopped, Channeled, and
Sectioned car could not total more than 4 inches. Car must be
equipped with full street equipment and be registered. |
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1958 - 1959: Car equipped with supercharged automatically
bumped up a class (B/G by calculation, A/G due to calculation
and supercharger equpped) |
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1960: 10% Engine setback allowable (rule implemented for engine
swapping). Forward most spark plug could not be relocated more
than 10% of the wheelbase behind the front axle. |
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24 inch maximum engine height from the ground (measured to
centerline of crankshaft), wheelbase minimum increased to 92
inches. |
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1962: Plexiglass windows allowed and removal of required street
equipment (exhaust, emergency brake, wipers, horns, generators,
license plates and registration) |
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1963: 90.5 inch Anglia wheelbase allowed equipped with
unsupercharged small block engine |
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1964: Fiberglass hoods, fenders, decklids, and doors are
allowed with addition of rollbar |
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1968: H/Gas - I/Gas - Can race class with any type cylinder
head; K/Gas required stock cylinder heads |
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References: |
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Montgomery, Don. Supercharged Gas Coupes. N.p.: 1993. |
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Stack, Byron. It's A Matter of Class. Trans. and ed. 2004 <gassermadness.us>. |
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