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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.
Oldsmobile 400 V-8 as a long block with crankshaft, cylinder head, camshaft, and valve train installed. A long block is an engine sub-assembly that consists of the assembled short block with crankshaft, cylinder head, camshaft (usually), and valve train. [5]
It had a forged steel crankshaft. [15] This dual-quad version was immortalized in the Beach Boys song titled " 409 ". In the 1963 model year, output reached 425 bhp (431 PS; 317 kW) at 6000 rpm and 425 lb⋅ft (576 N⋅m) at 4200 rpm of torque with the Rochester 2X4-barrel carburetor setup, a compression ratio of 11:1 and a solid lifter ...
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.
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.
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