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?
When I was in highschool, the Honda B-series was so fun. Smiles per dollar were through the roof. You could beat brand new mustang GTs with a $100 eBay turbo in your eg civic coupe shitbox. That gearbox was also so fun to shift too, solid linkage you bang gears as hard as possible without any flex.