Dictionary.com
Thesaurus.com

valve-in-head engine

American  
[valv-in-hed] / ˈvælv ɪnˈhɛd /

valve-in-head engine British  

noun

  1. the US name for overhead-valve engine

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of valve-in-head engine

First recorded in 1930–35