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Post-1971 blocks possibly had a lower nickel content but thicker cylinder deck, and post 1974 heads of the small-block Chevrolet used less iron, and were lighter weight, crack-prone, and were less powerful because of the lower compression ratios used.
The LT-1 is a Chevrolet small-block engine produced by the Chevrolet division of General Motors between 1970 and 1972. It was available exclusively in the Corvette and Camaro and was produced in relatively small quantities. It is regarded today as one of the greatest of the Chevrolet small-blocks, an engine that has been in production since 1955.
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
The new logo formally adopts the Small Block name for the engines. The fifth generation of the iconic GM small block engine family features the same cam-in-block architecture and 4.4 in (110 mm) bore centers (the distance between the centers of each cylinder) that were born with the original small block in 1954.
Chevrolet small-block engine: 1968-1972 200 hp @ 4400 RPM 300 lb-ft @ 2400 RPM 327 cu in (5.4 L) V8 Chevrolet small-block engine: 1967-1968 220 hp @ 4400 RPM 320 lb-ft @ 2800 RPM 350 cu in (5.7 L) V8 Chevrolet small-block engine: 1969-1972 4-bbl 250 hp @ 4600 RPM 350 lb-ft @ 3000 RPM RPO code LS9 351 cu in (5.8 L) V6 GMC V6 engine
The small-block V8 engine was introduced in the 1962 Ford Fairlane and Mercury Meteor cars. Displacing 221 cu in (3.6 L), it was designed to save weight, using thin-wall casting for a short-skirt block that does not extend below the centerline of the crankshaft.
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The early engines' bell pattern differed from AMC V8s. In 1971 AMC raised the block height and lengthened the stroke on the 199 and early 232 engines. The 199 became 232 cubic inches and the 232 became 258. These two RB or "raised block" engines shared the small bell pattern of the earlier engines for only the 1971 model year.
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