1961 NASCAR International Rule Book Specifications NASCAR Grand National Championship Circuit Section 21-17 -- Carburetor

a. Carburetor must be listed for make and model.

b. Cars are limited to one four-barrel carburetor.

c. Jets may be any size.

d. Chokes must not be removed from carburetor.

e. Wedges permitted.

f. Heat risers may be blocked.

g. Any NASCAR approved gasoline filters may be used. This applies to all late model divisions as well as speed trial and record attempts.