Championship for Sports Saloon cars, including Pickups, originally designed and built for road use:

Class A Silhouette Special Cars/Pickups 2501cc plus

Class B Silhouette Special Cars/Pickups 1801cc to 2500cc

Class C Silhouette Special Cars/Pickups up to 1800cc

Class D Modified 2501cc plus

Class E Modified 1701cc to 2500cc

Class F Modified up to 1700cc

Class G Silhouette Specials with motorcycle engines