I bought a non running 35' F20. I noticed all 4 pistons had a single 1/8" diameter or so divot/hole in the same spot/location when looking through the spark plug hole - opposite side/ nowhere near the spark plug. I took a small piece of wire to see if any completely went through the piston, they did not but seemed to be about 1/8" deep or so. Is this typical of IH pistons or other brands and if so what is the reason? Again, they are in the same location on each piston and look exactly alike - looks to be not quite centered. Got my curiosity!
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