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An overhead valve engine (OHV engine) is an engine in which the valves are placed over the cylinder head. This was an improvement over the older flathead engine, where the valves were placed in the block next to the piston.
While we really doubt the 5.7 Hemi-powered full-size Dodge truck would smoke a front engine digger (even with the chute deployed), the 345hp rating did pique our interest. We know modern fuel injection and electronics can make a relatively small displacement V-8 far more efficient than a carbureted version, but we felt the power and economy this engine produces had to be attributed to more than computers.