Introduced in 1970, the Chevy 454 -- affectionately known as the Rat Motor -- was the largest displacement Chevrolet engine to enter the big-block engine ... iteration is now 30 years old.

was rated at 370 horsepower but lost 30 lb-ft of torque somehow with its 450 lb-ft rating. The 429 Thunderjet and Cobra Jet featured similar two-bolt main bearing 385 big block architecture ...