Increased displacement played a major role in GM's 1970 intermediates after corporate brass lifted the 400-cubic-inch limit, allowing its various divisions to let loose a herd of big-inch beasts with unprecedented horsepower and torque ratings approaching- and sometimes exceeding- 500lb-ft. Few offerings of the classic muscle-car era were as brash as the 1970 Chevelle SS454, which was available with either the LS5 454/360 HP big block or the even more potent LS6. This premier American muscle car is among the most popular and sought after today, especially in convertible form.