LITTLEFIELD ALUMINUM  Blower Supercharger GMC 471 671 FRONT Bearing HOUSING Plate 1471 FITS GM AND MANY OTHERS USING THIS STYLE CASE ,IT HAS A CRACK AT ONE THREADED HOLE ON BEARING BOSS,I HAVE SEEN MANY OF THEM FIXED BY PRESSING BOSS A RING OVER BEARING BOSS TO STOP IT FROM SPREADING ,SOLD AS IS