If forged pistons then it might have full floating pins then it could be a snap ring got loose or probably wasn't secured in the first place.
Press fit pins don't move but it is *possible* that is was pressed in the wrong distance but had just enough to allow assembly. The rod side clearance allowed it to rub. I say "pressed in" but in reality you heat the rod end and then quickly set the rod in place and slip the pin through. Once it cools it shrinks on there. A fixture is typically used so the pin ends up where it is supposed to.
It possibly could be sleeved if the block is important. Some of those early 60's blocks were pretty generous with iron and have thick walls. Some of the early 283's would take a .125 overbore and you could build yourself a 301.
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Today's Featured Article - Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
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