<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (September 2007) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (September 2007) (Learn how and when to remove this template message) </Td> </Tr> <P> An overhead valve engine (OHV engine), or "pushrod engine", is a reciprocating piston engine whose poppet valves are sited in the cylinder head . An OHV engine's valvetrain operates its valves via a camshaft within the cylinder block, cam followers (or "tappets"), pushrods, and rocker arms . </P>

Where are the valves located in an engine