Overhead valve engine
![Components of a pushrod valve actuation system](/Images/godic/202501/30/Pushrod23728.PNG")
![Picture of a V8 engine block (with intake manifold removed), showing the camshaft, pushrods, and rockers.](/Images/godic/202501/30/Pushrod_engine3728.jpg")
![Valve-In-Head engine, illustration from 1904 patent, Buick Manufacturing Company](/Images/godic/202501/30/Valve-In-Head_1904_patent3728.jpg")
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.