Claim to fame: most powerful four-cylinder Chevy production engine. Until very recently, you would never equate the concepts of 310 horsepower and 420 lb-ft of torque with a four-cylinder engine.

The year was 1969, and the muscle car era delivered some of the best factory stock performance ever. A rivalry that began just a few years prior with the launch of the 1967 Chevrolet Camaro Sport ...