Is this engine builder nuts?

Smaller cam? They have pretty good sized rollers. Small compared to race motors, very large compared to what any A motor ever got. MPFI really tames them despite the cams being a bit large. They're just soft on the low end until they get up into their range. Relatively small bores, mid-sized valves, and long strokes. .

They got decent lift numbers but are very short on duration about the same as the magnum, If the magnums cam came with similar lift numbers there would be less of a hp difference between the 5.9 and the 5.7.