I adjusted my valves twice in the first 20k. Each time they didn't need anything worth mentioning so I let it go 'til one day at 62k, I felt a need or suspicion, so I did it and found several real tight. I gave them all a thousandth over specs. Closed it up, adjusted the idle mixture and speed. Everything seemed fine except the valve noise seemed to be louder and I thought I had a knock. Common sense would say I left something loose and I didn't want to do it again so I came to the forum and found possibilities that were worth looking into before going into the valve train.
1. Chain tensioner, Loosen the two bolts that hold the cam chain tensioner about 1/8" out then re-tighten both and see if the noise goes away.
2. Exhaust emission gasket out of place
3. Alternator drive bolt, Pull the alternator (one connector and 3 allen bolts) and check the bolt that secures the drive flang/impeller. A few people have had this come loose and it kind of rattles and knocks. A few times back while dooing the valves, I took mine out and removed the bolt, then put it back in with locktite.
I studied the pictures and procedures for Chain tensioner R&R, as well as what good ones and bad ones looked like and a manual tensioner.
I followed the manuals removal procedure and did not find anything wrong with it. I followed your 1/8" procedure for installing. Started it up and couldn't believe how quiet it was. I am impressed. I've twisted wrenches for over 55 years and knew something real bad was wrong. It sounded and felt bad.
I can't thank all of you enough, for sharing your problems and answers.