The rebuilder on my old Buick told me that they always make the pistons and
rings fit a little looser than stock because the replacement pistons have a
tendency to expand a little more, and of course, the walls are that much
thinner. So he said to expect a little smoke until the operating heat comes
up.
I must say that what you describe sounds more like an unrebuilt engine.
Maybe the rebuilder could be helpful, since the problem may reflect on his
workmanship.
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