I keep hearing about "tight valves" discovered at adjustment time. I looked, there are endless threads about tight valves, but I can't find one that tells me why.
On the gassers, top engine things seem to get loose.
Why do they get tight on these beasts?

I don't know when the last time my valves were adjusted; not since I have owned the car. And I don't know how many miles I have gone; odometer no-function.
Call it blissful ignorance.
I change my oil often, and she starts great (even though I still have to change a dead glow plug), and though it is non-turbo, she is really fast, just purrs, smooth enough at idle.
So, I haven't been too worried about valves, but when I keep reading about tight ones, I got to wonder.....

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Think Alternative Energy!
300CD '80 (now gone but not forgotten...)