So, this is a longer sort of vlog video. About 8 minutes in, the man at the machine shop starts talking and that's the important part. The machine shop owner claims heads should not just be resurfaced, but if the head warped, it needs to be essentially heated back up, and he basically torques it down in a specific pattern to straighten the head out. He says if you just mill a head flat, that the bind inherent in the head causes the cam to run offset to the original journals, and grind the journals down, and causes failures like broken cams, snapped timing gears, etc. He even goes as far to say that you should not even mill a head flat unless you straighten the head first, and it's better to just throw a new gasket on unless you want to go through the straightening process. He also showed based on the amount of carbon (I think) that compression was higher on certain cylinders than others due to the inherent bind in the head. Interestingly, too, he likes that she ran Valvoline VR1, and said her head being in the condition it is was a good advertisement for how good it is. Any thoughts on his theories? It's honestly something I've never heard before, and "conventional wisdom" is to always mill down your heads when changing head gaskets.