The stock , cylinder head, cylinder head or cylinder block cover is the top of an internal combustion engine allowing closure the combustion chambers .
constitutes the upper end of the engine cylinder block and sit on it the valves , with holes for that purpose. The stock has a double wall to allow the circulation of coolant. If the internal combustion engine is spark ignition (Otto engine ), Has tapped holes which are located plugs. In case of compression ignition (Diesel ) takes place in the holes (nozzle ) is.
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