I've run into a few briggs lawn mower engines with valve seat recession. They were flat heads and some times it was the intake valve.
I remember the old VW air cooled engines. They had no oil filters and you were to change the oil every 1500 miles and while you were at it, pop the valve covers off and adjust the valves. The VW was bad for burning valves and valve seat recession. BTW, we had lead in the gas too.
However, today's briggs and kohlers with overhead valves, it seems to be the opposite problem. The valve clearance increases, causes the compression to go up and it acts like you have a bad starter or a dead battery. I had to readjust the valves on 3 briggs this spring. I'm no rocket scientist, but I would think if one had valve seat recession on OHV engine, the valves would tighten up, not do the opposite.
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