The Stanford University Libraries just released more than 178,000 historical images related to racing and automotive history in its Revs Digital Library. Simply searching “engine” on the site’s homepage produced more than 1,000 results that will keep all power-obsessed gearheads glued to the computer for hours.
https://revslib.stanford.edu/collection
Careful.. One click and you lose all day. Don't blame me if you lose your job !
Enjoy !!!