I want a full-sized half ton pickup with a supercharged 3 liter diesel engine. I don't think a normally-aspirated 3.5 to 3.8 liter would be strong enough, but I could be mistaken. It needs to be able to haul a yard of gravel or load of firewood, or pull a small boat or trailer, or cruise 75 mph down the highway. Doesn't need to be able to do all those things at the same time.