Introduced in 1970, the Chevy 454 -- affectionately known as the Rat Motor -- was the largest displacement Chevrolet engine to enter the big-block engine showdown of the muscle car era.
This gave its division the opportunity to expand existing big blocks and create some of the most impressive muscle car motors of the era. At Chevy, a new 454-ci (7.4-liter) high-performance Mark ...
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.