Few American cars are as iconic as the 1957 Chevrolet. The ’57 Chevy was equipped with a six-cylinder 235-cubic-inch engine as standard equipment. Two eight-cylinder engines were optional: the 265 and the 283. Because the eight-cylinder engines featured the same design, their tune-up specifications are identical. Aside from the spark plug and ignition point gaps, the six-cylinder engine has its own tune-up specs.
The spark plug gap for the six-cylinder engine and for both eight-cylinder engines is 0.035 inches.