Tiny,
Thanks for posting that engineering info. Here's what fan manufacturer Spal has to say regartding push vs. pull:
https://www.a1electric.com/spal/faninfo.htm. But as you point out they don't give any back up data. You'd think they know since they make the things
If this subject of cooling improvements interests you, you might enjoy seeing what the factory optional fan shroud for my '36 Chevy PU looks like. It's not like what is used today but it definitely works. I could send you a photo if you like.
