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I have 60w Valvoline VR1 dino in mine and it helped a little over any 20w50 dino or synthetic I've tried. Still clatters like an old Model N Ford tractor, but earplugs help tune it out.
At cHarlie's suggestion I'm running the 90T big oil filter I got from LakeShore HD and on my own tried the RevTech 25w60 as Fred suggested. The noise is slightly softer but far from gone.
stubby; depends on if the top-end noise is excessive, or being caused by something abnormal. If so, best to get it checked out...like Freebird suggested - heads/cams.