FLUENT for Internal Combustion Engine Design
Check out page 6. I'll let everybody take a look and post their thoughts before I give my insight. 2 clues; Diesels are the main focus of emissions R&D right now and what good is an engines power if that engine can't be used in production because it fails for soot particle size?

 

Automakers are having the same type of problems right now, mainly CAFE and the way that it is measured. IF a new method is made that accurately measures fuel mileage instead of the present inaccurate window stickers, they are in deep trouble. They will have to cut power, regear, and make more low-speed torque. I hate engines that have to cruise over 2,000-2500 RPM anyway.

IMO, Dodge had a good head in the mid-late 80s. The swirl port/fast burn heads that were used on the 318s. Those engines made good power and got good economy for what they were.

Also the GM TBI and OBS Vortec 305/350 were good engines, then the HP wars began.