My old engine builder (Retired) always used Johnson flat cam lifters. I had a freshly rebuilt 455 with a RAIV cam and Johnson lifters. I had a couple of ticking lifters. I took them all apart one at a time and washed them out with solvent. Quiet as can be from then on. It only takes a piece of fly sh!t in there to make them tick I think. Unfortunately, you can't get the plunger out of the rollers that I know of.
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