Hey everyone, I've got a pretty noticeable tapping (knocking?) sound coming from my top end. It's a 79 special - mostly stock, pamco, performance airpods. Installed oversized pistons in January and had the valves recut and seated by my mechanic. I've taken it to my mechanic who is very good with old yams and he said that the cam chain is adjusted correctly and said he adjusted the valves but I still have this knocking noise.. I haven't done these things myself so I don't know how the cam chain or valves actually are right now and have only taken his word. Here's a youtube video of it idling. When I'm riding it I can sort of "milk" the tapping sound between usually 3-4K rpms. Right now I'm assuming it's the valves. Any thing else it could be? Piston slap? I've watched the videos posted here on adjusting valves and would like to take a look but I don't have feeler gauges so I'll need to buy some... Would love any insight.