my question is will a non OD hemi get that much better mileage than a non OD LA motor? just curious. i don't know the answer. i know the efi can make it more efficient because its constantly fine tuning but efi can easily be put on a LA motor.
I think it depends how you build it, 400 plus hp LA engines are built with rather large cams where the hemi uses lots of port flow with mild cam. If built that way I don't think it would be a huge difference, every talks about modern technology and fuel mileage but that's mainly highway in town they really haven't improved mileage that much, my 400 Cid Bronco and 5.9 jeep and my cousin hemi truck all get about the same in town.
