Improved design for the Single Cylinder Rod Bearing.  Part # 53307. These bearings are designed with the same material overlay as the older Federal Mogul bearings (which are discontinued).  The new design has the upper and lower half with the tabs that will face each other. Our redesigned rods will accept the bearing with the corrected lock tab cuts.  If you have an older rod you will need to add a lock tab cut on the rod cap side, the cut will go on the camshaft side of the cap.  These rod bearings have been narrowed so no need to chamfer the edge of the bearing.  Running clearance should be .0035".  We also have .003" undersize bearing available for slightly worn cranks part # (53471)