The Chilean Formula Three Championship is an open-wheel racing series competition in Chile.
The cars must have a chassis (monocoque or tubular steel frame) manufactured domestically, Nissan GA15S/GA15DS engine and a 4-speed transmission (reverse gear optional). The displacement of the carbureted engines may be increased up to 1600cc.[1]
From 1972, The Chilean Formula Three Championship did not follow at any time, any of the FIA rules, for chassis or engine, and by the way, cannot be considered as a "Formula Three" championship.