Internal-combustion engine having both inlet and exhaust valves located in the cylinder head WordNet 3.0 & Open English WordNet

An overhead valve engine, sometimes called a pushrod engine, is a piston engine whose valves are located in the cylinder head above the combustion chamber. Wikipedia

Type of piston engine Wikidata

A type of internal combustion engine design which has the inlet and exhaust valves in the cylinder head (and therefore above the piston). The camshaft can be beside the pistons (with pushrods and rockers operating the valves) or above the valves, with the latter usually referred to as overhead cam. Wiktionary