Thanks every one for the welcome.
Welcome aboard
C/G would that be 2 bbl carb class?
Classes were set by weight per cubic inch.
Supercharged classes:
A/GS
6.00 to 8.99 lbs. per cubic inch
B/GS
9.00 to 12.59 lbs. per cubic inch
C/GS
12.60 or more lbs. per cubic inch
Unsupercharged classes:
A/G
5.00 to 8.99 lbs. per cubic inch
B/G
9.00 to 10.49 lbs. per cubic inch
C/G
10.50 to 11.49 lbs. per cubic inch
D/G
11.50 to 12.99 lbs. per cubic inch
E/G
13.00 to 14.59 lbs. per cubic inch
F/G
14.60 or more lbs. per cubic inch
G/G
5.00 to 10.99 lbs. per cubic inch
H/G
11.00 or more lbs. per cubic inch
G/G and H/G were for non-supercharged pre-1960 flathead V-8’s, in-line six cylinder and straight eight engines with stock production-type heads and pre-1960 unblown 4-cylinders with any type head.