Beginning in July , he competed in the final 14 races of the 55 - race season , winning four times .
But NASCAR eventually did away with its ban of the Chrysler 426 Hemi engine and Petty returned to stock car racing late in the 1965 season .
Beginning in July , Petty competed in the final 14 races of the 55 - race season , winning four times .
But NASCAR eventually did away with its ban of the Chrysler 426 Hemi engine and Petty returned to stock car racing late in the 1965 season .