welp, I had my truck out this weekend and I figured I'd hold a bill there and see what happens. Long story short, I ended up with half a dollar in my hand, the other half got ripped right off so I guess I have burnt valves.
I'm gonna have to get a valve job on those f'ers, but for the future, is there any way to know what caused this?
I don't want to do all the work to get these heads off and back on again and have this happen again.