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While visiting our favorite ice creme shop "Mo Fats" yesterday our 66 suddenly made a loud knocking noise, for 4 - 5 seconds and coughed once. Then continued on with no noticeable ill effects. Checked plugs today and compression; no problems found. My question is this what might occur if a piece of a piston broke off? The engine is 15 years and maybe 30k from the rebuild.