The build month of the Chevelle is coded as a single letter. First production month for the 1967 Chevelle was August of 1966 in preparation for a September introduction.

Letter Month Letter Month
V August 1966 L September 1966
R October 1966 K November 1966
Z December 1966 S January 1967
P February, 1967 W March 1967
N April 1967 *Y *May 1967
T June 1967 X July 1967