Check the screen for the oil passage to the tensioner they get plugged with silicone and stop oiling the chain I had same problem after doing the same job

I see many of these with the same problem. Keepers are failing dropping valves, seems #1 cylinder more often then others

I bought a Nissan xterra from a customer who had a headgasket leaking and didn't want to fix it. I poored Blue devil in for giggles because I was too lazy to do headgasket at the time on my own car. It sealed it up and have been driving it a year now with no problems.....crazy I know but for 500 dol...