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The W-series was a physically massive engine when compared to the "small-block" Chevrolet engine. It had a dry weight of approximately 665 pounds (302 kg), depending on the type of intake manifold and carburetion systems present. It was 1.5 inches longer, 2.6 inches wider, and 0.84 inches shorter than the 283 "small-block". [13]
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 ...
This was so named because it began with Chevrolet's V8 engines. Chevrolet big-block V8s; Chevrolet small-block V8s; GM Vortec 4300 90° V6; GM Iron Duke RWD inline 4 (early RWD Variants, later versions may use a FWD pattern, and have two possible starter locations) Jeep with GM Iron Duke inline 4 2.5L/151 in 3 (1980-1983).
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.
[23] [24] For 1969, the engine line was revised; the previous small-block V8s were dropped in favor of a single 350 V8 and a 427 V8 was introduced above the 366 big-block V8. [25] GMC trucks were offered with 305 and 351 V6s, which were available for Chevrolets for 1972.
In the IR-9 "Can Am" version, the engine was switched from the 427 engines to the newer, even more powerful Chevrolet 454 7.4 litre engine. Iso Grifo Can Am with the characteristic 7-litre engine "penthouse" on the hood and Grifo Series II hide-away headlights. In 1972, the Grifo IR-8 was introduced, using a small-block Ford Boss 351 engines.