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It is an all-iron engine (block and heads) with two valves per cylinder. It retained the 4.25 in (107.95 mm) bore diameter of the old 7.0 L (427 cu in) and 7.4 L (454 cu in) big-blocks, but the stroke was increased to 4.37 in (111.00 mm) for a total displacement of 495.95 cu in (8.1 L).
In 1966 the L78 was available exclusively in the intermediate line. For 1967 the engine was additionally available in Chevrolet's new pony car, the Camaro. The following year the motor became available in the compact Chevy II also. For the 1970 model year the 396 was bored 0.03 in (0.76 mm), resulting in a 402 cu in (6.6 L) engine.
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 455 big block Olds V8 was replaced in 1977 with the 402.6 cu in (6.6 L; 6,598 cc) small block, which used a 4.351 in (110.5 mm) bore, the largest ever used in a small-block V8, with the Olds small-block standard deck and 3.385 in (86.0 mm) stroke. The bore was so wide that the cylinder walls were siamesed, as in the Chevrolet 400 V8, with ...
While the 302 became a strong Limited Sportsman oval track racing engine in the hands of racers like Bud Lunsford in his 1966 Chevy II, its bore/stroke and rod/stroke geometries made it a natural high-rpm road-racing engine and were responsible for its being among the more reliable production street engines homologated for full competition ...
This was especially common in US muscle cars, like the Ford Mustang Boss 302 and 429, and later GT 5.0L, The Plymouth Roadrunner 383, and the Chevrolet Chevelle SS 396 and 454. However, trends towards downsizing and hybrid/electric drivetrains since 2010 have resulted in far fewer model names being based on the engine displacement.
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This early version used a Chevrolet small block V8 bell housing bolt pattern. The 1984 and later model GM 151s used the corporate GM four-cylinder/small V6 bolt pattern (not used by AMC). Bore × Stroke 4.00" × 3.00" Compression Ratio 8.2:1; Horsepower (net) 82 hp (61 kW) @ 4,000 rpm; Torque (net) 125 lb⋅ft (169 N⋅m) @ 2,600 rpm