Big block engines have more metal and more or larger cylinders. They tend to produce more power and torque because of their weight. Small blocks are just that — small or smaller than big blocks. While ...
By 1970, the Chevelle SS had reached its most outrageous specification, with a huge 454 cubic inch (7.5-litre) big block V8 that could be ordered with an advertised 450bhp and 500lb ft of torque.
The 396 Mark IV Big Block, rated at 425 horsepower, debuted for 1965. For 1966, the Mark IV grew to 427 cubic inches in displacement. Two different versions were available, one rated at 450 ...