Decided to knock some items off my list today and went back under the hood. Since I'm just about to hit 200K miles, I figured I'd go ahead and change the oil, replace the spark plugs, wires, dizzy cap (new rotor was on the list too, but the one I got delivered was the wrong size), and adjust the valves.
While I had everything apart, I figured it was a good time to drill out the oil galley push plug above the #5 spark plug and complete that fix. I've been avoiding that project because I don't have much experience drilling and tapping and didn't want to really screw something up. I decided that today was the day. After pulling the air cleaner assembly, I went ahead and removed the head bolt that the plug goes into. I figured it was right there and I might as well do the best job I could. After removing the bolt, I wrapped a wire brush in a paper towel and coated it with some moly grease, then stuck it in the bolt hole. The idea was to catch any metal shavings from the drilling and tapping.
I'm glad I did that because there were quite a bit of metal shavings on it when I was done. After the hole was tapped and everything cleaned up, then it was just a matter of inserting the set screws and moving on the everything else. I didn't like how loose the set screws were in the threads, so I went ahead and smeared some JB Weld on the threads and screwed in two screws. I'm pretty confident that it will be good to go for a while.
After that I finished up everything else on my list. I've never done a valve adjustment before, but it ended up being fairly easy. I wasn't expecting much when I finished, but I got quite a surprise when I was done. After putting everything back together, I fired up the engine. I had no idea that it could run that quiet! My idle smoothed out significantly too. It was too late to take it for a test drive, so that will happen tomorrow. I'm excited to see if I can feel a difference in the responsiveness now too.