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At Annual this past spring we had a burned exhaust valve on #5 cylinder, on our 1100 hour o 470L. Time was tight, as my A&P/ Son doing the annual was joining the army. So we elected to buy a new superior Cylinder and piston. We noticed the piston weights were different, WM on the old cylinder WS on the new. My son consulted his boss an IA who…[Read more]