One quick way to tell a roller from a flat tappet cam, other than the shape of the lobes, is that Isky and most other manufacturers roller cams are machined from steel billet blanks, while the 'regular' (solid and hydraulic) flat tappet cams are made from cast iron blanks. That's why I asked if there was a "T" after the '505' stamped on the nose. The 505T that I had was a definitely a roller cam. I'm not sure, but your 505 Magnum may be a solid lifter (and possibly, even hydraulic lifter) flat tappet cam.
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