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A 400 cu in (6.6 L) small-block V8 in a 1975 Avanti II. The 400.92 cu in (6,570 cc) 400 is the only engine in this family; it was introduced in 1970 and produced for ten years. It has a 4.125-inch (104.8 mm) bore and a 3.750-inch (95.25 mm) stroke.
Torque 250 cu in (4.1 L) I6 Chevrolet High Torque engine: 1967-1972 1-bbl 155 hp @ 4200 RPM 235 lb-ft @ 1600 RPM Known as "Turbo-Thrift" in passenger car installations 283 cu in (4.6 L) V8 Chevrolet small-block engine: 1967 175 hp @ 4400 RPM 275 lb-ft @ 2400 RPM 292 cu in (4.8 L) I6 Chevrolet High Torque engine: 1967-1972 1-bbl
Chevrolet small-block engine (Gen 1: 3.736-inch bore family) 1988–1993 L03 175 hp (130 kW) @ 4000 RPM 270 lb⋅ft (370 N⋅m) @ 2400 RPM less than 8,500 lbs GVWR 1994–1995 175 hp (130 kW) @ 4200 RPM 265 lb⋅ft (359 N⋅m) @ 2800 RPM less than 8,500 lbs GVWR [13] Chevrolet small-block engine (Vortec 5000) 1996–1998 L30
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.
But the "Ram Air" 400 also mandated steep 4.33:1 gears(or 3.90:1 in Firebird), making the Quadra-Power 400 (400 HO) the top practical street engine option for most drivers. Standard ratio with the 400 was 3.55:1(except 3.36:1 in Firebird for 1969) regardless of transmission(3.23:1 for cars with air conditioning).
The Chevrolet small-block engine refers to one of the several gasoline-powered vehicle engines manufactured by General Motors. These include: The first or second generation of non-LS Chevrolet small-block engines; The third, fourth, or fifth generation of LS-based GM engines; The Chevrolet Gemini small-block engine
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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]
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