I have a set of Rhodes lifters on an Isky cam in one of my non Mopars. It has upper valvetrain noise for sure, but after several thousand miles it is the same as when installed. The lifters "slap shut" from what I understand, you hear it more at the rocker arms I think. I replaced the intake and got to look at the cam lobes last year, they had a nice polish on them all. I always liked the sound, it is only slightly more noisy than original. Sounds like a solid setup somewhat.......and it runs so good, I never thought about changing them. This year I added ZDDP to the oil change, "just in case" and it actually quieted it down a tad. But I would never change them, it is part of that car's personality.