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The engine had 238k miles when I tore it down and the chain guides looked very good.Any chance you saw the old timing chain guides & had the plastic inner of either pulled loose of the metal arm?
Miles on motor as you were breaking it down for machine work?
Just curious - long ago Christo said that was common but not a serious problem as the plastic stayed close to where it was on day 1, it just dropped a bit but chain still held it where it acted like the guide works.