IF IT WHERE MY ENGINE I WOULD LOOK THE LINE BETWEEN THE CAP AND THE BLOCK WHEN THE CAPS ARE TORQUED IN PLACE.SOMETIMES YOU CAN SEE A FEW THAT DON'T LINE UP.DO YOU OWN IN-SIDE BORE GAUGE?MAYBE THE CAPS WHERE SWITCHED WITH ANOTHER ENGINE.IF IN DOUBT HAVE IT LINE HONED,OR BORED.