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It's not your CAS. A bad CAS would never make a sound that horrendous. To me, it sounded like it was coming from under the valve cover for sure, but not necessarily loudest at the CAS. Even if so... no way in hell the CAS could be the culprit.
You really need to remove the cams & inspoect them, the retainers & journals... and make sure the oil squirters are working properly.
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