Overhead-valve definition

(automotive) A type of internal combustion engine design which has the inlet and exhaust valves in the cylinder head (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.
noun
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Other Word Forms

Noun

Singular:
overhead-valve
Plural:
overhead valves