65 Barracuda daily driver

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I haven't taken out the lifters completely, but I've been able to look at the bottom side of most of them and I can't see any wear on them. They look almost new. I forgot to check the rocker arms, but will do tomorrow.

On the slant I replaced all the lifters without really checking them, but it solved the problem aka it stopped the ticking. Could they just be bad internally? And how do you test that? I've been looking here on FABO, but haven't found an answer yet. Will keep looking.