Aluminum cylinder head deck face showing four combustion chamber…

Bare aluminum cylinder head stood on end on a concrete driveway, showing the combustion-chamber deck face with four two-valve chambers and their intake and exhaust seats. A caption bar across the bottom reads '99+ 4.6-5.4L GT/F-150 "Performance Improved" head.'

AI caption June 2003 · Photo 29 of 2456