It turns free. The housing part # is 5116106.
LITTLEFIELD MAG Blower Supercharger GMC 471 671 Rear COVER Bearing Plate 1471
Vintage Blower Supercharger GMC 471 671 Bearing Plate Cover Housing 5122363
Blower Supercharger BBC Timing Cover GMC 671 871 NHRA IHRA IMCA Mud truck RatRod
Vintage GMC Blower Supercharger 4/71 6/71 8/71 Rear Bearing Plate and Cover
Blower Supercharger Screen GMC 671 SBC BBC NHRA IHRA IMCA Mud truck Rat Rod Drag
GMC BLOWER SUPERCHARGER BILLET BEARING PLATE REAR COVER (4 Corner)
