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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.
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). These use a Chrysler custom Torqueflite 904 automatic transmission with an integral Chevrolet bellhousing.
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.
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
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
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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).