1962 NASCAR International Rule Book Specifications NASCAR Grand National Championship Circuit Section 20-15 -- Pistons

a. Pistons must remain standard. No filing or cam grinding. No alterations permitted.

b. Any make or brand piston ring permitted, but a full set of piston rings must be used. This applies to all late model divisions as well as speed trial and record attempts.

c. Valves may be refaced, reground, and seated by the usual commerical method only.

d. Any and only conventional valve springs allowed.