have a B&S 12 hp block vertical ,has broken cooling fin where the coil mounts to engine , and a B&S 11 hp engine looks identical ,can the block from a 11 hp be swapped for the 12 hp engine taking the guts out of 12 hp for use in the 11 hp crank, cam,etc, valves would use piston and rod from 11 hp with all other parts from 12 hp are they identical; or different , need to know , as one in my shop has that fin where the coil mounts to engine broken and doubt if one screw will hold the coil tight enough need to swap or buy new