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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 ...
All MEL engines had wedge-shaped combustion chambers formed between a flat head surface and an angle milled block deck (10 degrees off square with the bore axis), with the piston top determining the compression ratio and combustion chamber shape, similar to the Chevrolet Big-Block 348 combustion chamber, also introduced in 1958, and the later 409 and 427.
The Chrysler B and RB engines are a series of big-block V8 gasoline engines introduced in 1958 to replace the Chrysler FirePower (first generation Hemi) engines. The B and RB engines are often referred to as "wedge" engines because they use wedge-shaped combustion chambers; this differentiates them from Chrysler's 426 Hemi big block engines that are typically referred to as "Hemi" or "426 Hemi ...
The cylinder block is a chromium-nickel iron alloy with a 60-degree design. [ 10 ] : 34 It has a peak gross and net power output of 170 and 155 hp (127 and 116 kW) at 3200 RPM, respectively, and corresponding gross and net torque output of 310 and 290 lb⋅ft (420 and 390 N⋅m) at 2000 RPM, respectively.
There was also a "Service Replacement" block made as a modified GEN-3 design. This is a 401 casting (same casting number) without the displacement cast into the side and with a 360 bore and thicker deck. In theory, this single block could be built as any 343-401 GEN-2 or GEN-3 engine.
1978–1979: 6DR5 2.5 L 6G73 - Used in the Chrysler Sebring, Dodge Avenger, Chrysler Cirrus, and Dodge Stratus; 3.0 L 6G72 - Used in the Plymouth Acclaim/Dodge Spirit and 1987–2000 Dodge Caravan/Plymouth Voyager, also Dodge Dynasty, Chrysler LeBaron, Chrysler TC, Chrysler New Yorker, Dodge Daytona, Dodge Stealth, Chrysler Sebring (Coupe), Dodge Stratus (Coupe), Dodge Shadow ES, and Plymouth ...
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.
U.S. Pontiacs used a full perimeter frame.) and interior instrument panels. As Chevrolets under the skin, Canadian Pontiacs including the Parisienne used the same engines and transmissions as full-size Chevys, including the 230 and 250 cubic inch 6 cylinder and 283, 307, 327, 350, 396, 400, 409, 427 and 454 cu inch V8s.