Did Dodge put the 5.2 cam in the 5.9?
I had a 2002 5.9 cam reground by Bullet Cams and this is what they told me it measured out at stock:
Duration @ 0.050: I/E 189*/194*
Lobe separation angle: 111*
Lift @ cam: I/E 0.273"/0.278"
Valve lift w/ 1.6 rockers would be: I/E 0.437”/0.445”
Now this wasn't a new cam and had some wear, so even these numbers are going to be an exact spec for a new one. But they are a very close match to someone who had a '98 cam run through a similar machine:
Stock Cam Specs Measured - DodgeTalk : Dodge Car Forums, Dodge Truck Forums and Ram Forums
No idea if the 5.2 cam was smaller or not. I would bet even if it was bigger, it would be a big waste of time to swap it because it wouldn't be much bigger. But that's just my opinion.