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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.
Along with its small gasoline engine, the hybrid's primary propulsion system also draws power from a set of Prius battery packs. There are two of these in the Prius: a 12-volt LV, or Low Voltage, battery and a High Voltage, or HV, battery that outputs over 200 volts. While the LV battery starts the car and powers its onboard computer, the Prius HV battery is responsible for the actual electric propulsion of the car. In a third-generation Prius, this battery adds 36 horsepower to the power generated by the 1.8L gasoline engine for a combined output of 134 horsepower. With each generation of the Prius using slightly different battery packs, it is important that Prius owners know the right batteries to get.