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This block is one of three displacements, 302/327/350, that underwent a crankshaft bearing diameter transformation for 1968 when the rod-journal size was increased from the 2 in (50.8 mm) diameter small-journal to a 2.1 in (53.3 mm) large-journal and a main-journal size that was increased from 2.3 in (58.4 mm) to 2.45 in (62.2 mm).
The number of main bearings is primarily determined by the overall load factor and maximum engine speed. [1] Increasing the number of bearings in an engine will generally increase the size and cost of the engine, but also reduces bending stress and deflection caused by the distance from the crank pins to the nearest bearings.
The crankshaft stroke and main journal size changed among the years with the more popular 389CI and 400CI having a 3.00" diameter main journal and the 421/428/455 sharing a larger 3.25" diameter main journal. The V8 was phased out in 1981, replaced by GM "corporate engines" such as the Chevrolet 305 cu in small block V8.
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 260 was designed for economy, and was the first engine option above the Chevrolet 250 straight-six, then later the 3.8 L Buick V6, which was standard fitment in many Oldsmobile models by the late 1970s. While the 260s were not very powerful compared to the larger 350 and 403 V8s, fuel economy was almost as good as the base V6.
It also replaced the 250 cu in (4.1 L) in the Chevrolet and GMC full-size trucks and full-size vans, and in 1990, it replaced the 292 cu in (4.8 Lsssdrrytgj) in the Step-Vans as the new base six-cylinder engine. 4 The 262 cu in (4.3 L) [convert: invalid option] V6 has a 4 in × 3.48 in (101.6 mm × 88.4 mm) bore and stroke, identical to the 350 ...
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Chevrolet introduced the 350 cu in (5.7 L) LT-1 in 1970, making it available in both the Corvette and Camaro. It was an optional engine in the Corvette, and available as part of the high-performance ZR-1 option. Between 1970 and 1972, only 53 ZRs were produced, making it one of the rarest Corvettes.