I don’t know a ton about foreign motors other than surface level stuff like the 2JZ, Wankel, etc. so please forgive my ignorance outside of US motors.
However, in my eyes, it doesn’t get better than the simplicity and easily available power of the SBC, BBC, and 6BT. What are your all time favorites and why?
The humble BMW M50 (2.5L) and M52 (2.8L). Very simple engines with strong iron blocks and stout bottom ends. You can rev em to 7k+ without any issues and they’ll take a ton of boost on a bone stock bottom end.
I’ve owned several M50’s with over 300k miles on them with nothing done besides basic gaskets. I’ve tracked them quite a few times as well, spending a whole day at limiter, and they just take it like a champ.