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The 455 big block Olds V8 was replaced in 1977 with the 402.6 cu in (6.6 L; 6,598 cc) small block, which used a 4.351 in (110.5 mm) bore, the largest ever used in a small-block V8, with the Olds small-block standard deck and 3.385 in (86.0 mm) stroke.
Also called the GM small corporate pattern and the S10 pattern. This pattern has a distinctive odd-sided hexagonal shape. Rear wheel drive applications have the starter mounted on the right side of the block (when viewed from the flywheel) and on the opposite side of the block compared to front wheel drive installations.
1961–1980 Buick small block V8 (formed the basis of the 1961-1963 Oldsmobile 215 aluminum V8) (now better known as the Rover V8 and also the Buick-based "Dauntless V8" on Jeeps or the Repco V8 Formula One engine based on the Oldsmobile version) 1965–2009 Chevrolet Big-Block V8 (originally "Turbo-Jet")
Also available was the L77 V code 455 with 270 horsepower (200 kW) available only without air conditioning. Although Pontiac's SD 455 cubic-inch engine lasted one more year with 290 horsepower (220 kW), Oldsmobile's high performance 455 engine would only last one more year culminating with the L76 optioned 455 W-30 Hurst/Olds in 1974.
Effectively, production Pontiac V8 blocks were externally the same size (326-455) sharing the same connecting rod length 6.625 in (168.3 mm) and journal size of 2.249" (except for the later short deck 301 and 265 produced in the late 1970s and early 1980s before Pontiac adopted universal GM engines).
The motorhome had a front-wheel-drive transaxle, which GM called the Unitized Power Package, originally used in the Oldsmobile Toronado and Cadillac Eldorado with an Oldsmobile 455 cu in (7.5 L) V8 from the Toronado. In mid-1977 the engine was downsized to a 403 cu in (6.6 L) V8.
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