Dodge 1500 2002 5.9 Magnum Camshaft Flat, Roller, Hydraulic Roller

Hydraulic flat tappet cams and the lifters/tappets are much cheaper to buy so the rationale is there. But add in around $150 for new pushrods and that cost difference gets a lot smaller. If you do go with the flat tappet type, then make sure that the AMC type lifters with oiling holes in the tops of the plungers are used that push oil up through the pushords to the rockers in the Magnum.

As said, the roller cam profiles are superior to flat tappet when you look at the overall combination of HP, torque and economy. You get better lift-to-duration ratios.