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After more searching I found this thread and OlRon uses foil for checking for a .040-.050 cylinder head/piston clearance. Actually the engine rebuilder machine shops around here mill heads and my old C8MC heads were milled .010 back in the 80's when I first purchased the Merc and rebuilt the flattie. It was amazing how good it ran for how rough it was! Pulled the pan to find skirts laying in the pan. A typical Ford Flathead, they run forever and don't die! Been a loooooong time since I looked at milling heads on a Flathead and other than that remember hearing a local old timer mention he had one car with stacked head gaskets because the piston hit the head. Perhaps somebody by mistake put 239 Pistons in a 255?
https://www.fordbarn.com/forum/showt...7982&showall=1
Of course a forum called Fordbarn would be a good source!