The History and Engineering Behind Chevrolet High Output 425 Horsepower Muscle Engines
A new era began in 1965, when the mechanically destructive Mark IV big-block was introduced by Chevrolet. This engine was actually the result of the top-secret ’63 “Mystery Motors” program and replaced Chevrolet’s previous line of W-series powerplants, including the 348 and 409. The 396-cubic-inch V8 instantly became known as the “Rat Motor,” and was […]