Chevrolet Small-Block V8 Engine Specs

The Chevrolet Small-Block V8 is the name given to the original family of naturally aspirated OHV V8 petrol engines produced from 1955 to 2003, one of the most influential and widely produced engine architectures in automotive history. First introduced in the 1955 Bel Air as the 265, the family grew over its nearly five-decade production run to include displacements from 4.3 to 6.6 liters (the 265, 283, 302, 305, 307, 327, 350, and 400, among others), powering an extraordinary range of Chevrolet and GM vehicles including the Camaro, Corvette, Impala, Chevelle, and Nova.

Output across the family spans an enormous range, from 130hp in emissions-restricted late-1970s applications up to 375hp in high-performance fuel-injected variants, with torque between 325 and 563Nm, all built around the same fundamental OHV 16-valve, cast-iron (later aluminum in some applications) architecture that prioritized light weight, low production cost, and mechanical simplicity over technical sophistication. This combination proved extraordinarily successful: the original small-block Chevy became the default engine swap and hot-rod foundation for generations of American car enthusiasts, supported by what is likely the largest aftermarket parts ecosystem of any engine ever produced.

Because "Small-Block V8" describes an entire family spanning nearly fifty years and eight or more distinct displacements, any specific example needs to be identified by its individual variant (265, 283, 327, 350, and so on) to properly understand its specifications, known issues, and collector value - each of which is covered individually elsewhere in this database. As a general family, however, small-block Chevrolets share common maintenance themes: fundamentally simple and reliable pushrod, cast-iron construction with an enormous rebuild and parts aftermarket; a general need for age-appropriate inspection of timing chains, bearings, and cooling systems on any surviving example; and, for engines used in desirable vehicles like the Corvette and Camaro, genuine collector value tied closely to numbers-matching originality and documented history.