Overhead valve engine

Components of a pushrod valve actuation system

Picture of a V8 engine block (with intake manifold removed), showing the camshaft, pushrods, and rockers.

Valve-In-Head engine, illustration from 1904 patent, Buick Manufacturing Company

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. Overhead camshaft (OHC) engines, while still overhead valve by definition, are usually categorized apart from other OHV engines.

单词	Overhead valve engine
释义	Overhead valve engine 英语百科 Overhead valve engine 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. Overhead camshaft (OHC) engines, while still overhead valve by definition, are usually categorized apart from other OHV engines.
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