That could be caused by a piston skirt that is too long. A connecting rod that's too short or crank shaft counter weight that is too large in outer diameter. I'd recommend replacing the whole engine to be certain.
"The things that will destroy America are prosperity-at-any-price, peace-at-any-price, safety-first instead of duty-first, the love of soft living, and the get-rich-quick theory of life." TR