Big block V8

Big Block V8 is the term used to identify a series of engines produced by Chevrolet beginning in 1965. In 1965 Chevrolet introduced a new high performance engine in the full size Chevrolet and the Corvette. The engine was 396 cubic inches and was available in 3 different horsepower versions. 360HP 385HP and 425HP. The engine was larger than the existing V8 and weighed about 200 lbs more. To differentiate between the 2 engine series the smaller of the two became known as the "Small Block" and the larger engine series became known as the "Big Block". The Big Block, because of its design of the valve train(the valves were not in a straight line, but were offset over each cylinder) was also nicknamed "Porcupine V8". In 1966 Chevrolet offered the 427 cubic inch engine. The highest horsepower offered in the 427 in 1966 was also 425HP. This was controversial since the 396 in the previous year was also rated at 425HP. In 1967 Chevrolet expanded the horsepower offerings of the 427 and included a triple carburetor version for the Corvette advertised at 435HP. In 1970 Chevrolet added the 454 Cubic Inch. In later years Chevrolet made available a 503 cubic inch Big Block but it was only available for purchase through the factory and was shipped in a crate to the buyer.