So long story short: I noticed a slight change in my engine for a few thousand miles where it was running slightly off/rougher. Two days ago I was pulling into Costco and all of a sudden my engine was running like it was getting no fuel. It didn’t shut off but it was running really rough. I shut it off and I could never get it started again. I thought it was a fuel issue until I checked the belt again. This is a 100k belt that broke in 6k miles. The belt is still tight enough that I can’t pull it off with my fingers. What’s the chances of the valves being damaged?