One of the problems with radiators that are tilted for fitment is that the fins of the radiators and oil coolers are almost always perpendicular to the height measurement. Essentially, the only way for the radiator to experience full airflow is if the radiator is standing straight up&down. Of course you can duct the air around in order to get the straight through flow, however that would take a lot of room. About 20 years ago I was working a Petite Lemans race and noticed a couple of the LMP cars had specialty radiators whose fins were parallel to the airflow. I’m curious if anyone has done some efficiency analysis on sending air at a conventional radiator at a 45° angle vs. straight through. Also, as pointed out earlier, there must be some impact on aerodynamics (frontal area)... Thoughts?