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What is the engine with casting number 3969854?

The engine with casting number 3969854 is a 400 cubic inch small block Chevrolet V8 engine. It was produced from 1970 to 1980 and was used in a variety of Chevrolet vehicles, including the Camaro, Nova, Chevelle, and Corvette. The 3969854 engine is a 4-bolt main block with a bore of 4.125 inches and a stroke of 3.75 inches. It has a compression ratio of 10.5:1 and produces 265 horsepower at 4800 RPM and 355 lb-ft of torque at 3600 RPM.