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The Chevrolet big-block engine is a series of large-displacement, naturally-aspirated, 90°, overhead valve, gasoline-powered, V8 engines that was developed and have been produced by the Chevrolet Division of General Motors from the late 1950s until present. They have powered countless General Motors products, not just Chevrolets, and have been ...
Chevrolet's second generation big-block, the Mark IV had been introduced in 1965 in two 396 cu in (6.5 L) versions. In 1966 Chevrolet added a 427 cu in (7.0 L) version that was available exclusively in the sports car (Corvette) and full-sized (Impala, Bel Air, Biscayne) lines. While a 396 was still available in full-sized cars, the L72 and the ...
The service department specialized in engine swaps, transplanting 427 cubic inch displacement (CID) "Big Block" Chevy engines into the very first 1967 Camaros, [2] and soon after into Novas, Chevelles, Impalas, and Corvettes. Nickey Chevrolet modified cars to their customers’ specifications.
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.
396 in 3 Big-Block V8 added; side-discharge exhaust introduced. Last year of fuel injection until 1982. 1966: 27,720: $4,084 427 in 3 Big-Block V8 with unique bulging hood; 327 in 3 300-horsepower small block V8 standard. 1967: 22,940: $4,240
In 1967 the 421 was enlarged to 426.61 cu in (7.0 L) by increasing its bore to 4.12 in (104.6 mm). Both Chevy and Ford had 427 cu in performance engines, so Pontiac simply referred to its 427 as a 428 to one-up them. It retained the 421's 4 in (101.6 mm) stroke and 3 + 1 ⁄ 4 in (82.6 mm) main journal.