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The first version of the "big-block" V8 Chevrolet engine, known as the W-series, was introduced in 1958. [12] Chevrolet designed this engine for use in passenger cars and light trucks. This engine had an overhead valve design with offset valves and uniquely scalloped valve covers, giving it a distinctive appearance
The L72 was a 427 cu in (7.0 L) 90° overhead valve V8 big-block engine produced by Chevrolet between 1966 and 1969. Initially rated at 450 horsepower, the rating dropped to 425 hp (317 kW) shortly after its release (although there was no change in power).
The C3 fourteen-year run shows an extreme contrast. The list price for the Corvette in 1968 was $4,663 (~$40,856 in 2023). By 1982 the base price had increased to $18,290 (~$48,871 in 2023). In 1968 there were six engines, two small-block V8s and four big-block V8s. By 1982 there was only one small block V8 engine available.
The block entered production in mid 1965 as the Mark IV 396 cu in (6.5 L) "Turbo-Jet," phasing out the first-generation W-series Big-Block. In its first year the 396 was available as the L78 option in Corvettes and full-sized ( Impala , Bel Air , Biscayne ) models, and as the L37 in the intermediate ( Chevelle ) model.
The 427 big-block was enlarged to 454 cu in (7.44 L) with a 390 hp (291 kW; 395 PS) rating. The ZR-1 special package was an option available on the 1970 through 1972 model years, and included the LT-1 engine combined with special racing equipment. Only 53 ZR-1's were built. [45]
The 1965 Corvette Sting Ray became ferocious with the mid-year debut of the "Big-Block" 396 cu in (6,490 cc) engine producing 425 hp (317 kW). Ultimately, this spelled the end for the Rochester fuel injection system, as the carbureted 396ci/425hp option cost $292.70 to the fuel injected 327ci/375hp's $538.00.