The HP 290/350 is GM Performance Parts' value leading crate engine, with 290 horsepower @ 5100 RPM, and 326 lb-ft of torque @ 3750 RPM on 87 octane fuel. The HP 290 horsepower will provide great long term durability with its 4-bolt mains, PM steel rods, strong cast aluminum pistons. The camshaft has .450'' intake and .460'' exhaust lift with hydraulic flat tappets. The cast iron cylinder heads have 1.94'' intake and 1.50'' exhaust valves with 76 cc combustion chamber. The heads have the conventional 12 bolt intake manifold attaching design used from 1955 through late 1980. This 350 engine is not intended for marine use, and should be used in 1979 or earlier pre-emissions street vehicles or any off road usage.

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