OEM factory original USA made aluminum 4 speed bellhousing for big block Chevy with 168 tooth flywheel with 11” clutch - This is the hard one to find OEM - Bell would work for 3 or 4 speed, 10 1/2" or 11" clutch - Bare aluminum bell has been cleaned up in “as found” condition as shown – blasted with natural unpainted finish shown - no cracks or weld repairs found and rings true – threads in great shape - Casting number 464697 – same dimensions as 3899621 – center bearing retainer hole measures 4 11/16”