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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 ...
The big-block engines initially used a forged crankshaft with a stroke of 3.975" for the 1965-1967 425 and 400 CID versions; starting in 1968, both the 400 cu in (6.6 L) and the 455 cu in (7.5 L) big blocks used a stroke of 4.25 in (108 mm), with crankshaft material changed to cast iron except in a few rare cases.
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).
Engine offerings included the 110 hp (82 kW) 250-6, a 307 V8, a 175 hp (130 kW) 350-cubic-inch V8, and big block V8s of 402 and 454 cubic-inch displacements. The 402-cubic-inch (still known as a 396) produced 240 hp (179 kW); the 454 managed to put out 270 hp (201 kW) under the net rating system.
California cars included a 165 hp (123 kW) 350 cu in (5.7 L) 4-barrel as the base engine (not available in 49 states), and could be equipped with the 400 cu in (6.6 L) 4-barrel V8. The big-block 454 cu in (7.4 L) V8 was discontinued. The Turbo Hydramatic transmission became standard equipment on all 1976 Monte Carlos.
The car joins the sleek design of the 1969 Camaro with the rare, racing-oriented 427-cubic-inch ZL-1 big-block engine. 8. 1968 Ford Mustang GT390 ‘Bullitt’ – $3.4 Million
This move reduced horsepower ratings on the big-block engines to 300 for the 402 cubic-inch V8, but the LS5 454 option had an "advertised" five-horsepower increase to 365. Both 350 V8 engines and the dual exhaust 402 cid V8 engine were available without the SS option; only the LS5 454 V8 required the SS option.
1992–1997 GM LT "Generation II" small-block V8; 1997–2020 GM LS small-block V8 (referred to as Generation III or IV depending on type) 2014–present GM LT Generation V small-block V8 (Also called Ecotec3 V8) 2018–2020 Cadillac Blackwing twin-turbo V8; 2023–present Chevrolet Gemini DOHC V8; Cadillac Twelve engine