Front bearing plate includes the bearings, bearing retainers and seals. Front bearing plate and blower case have had performance modifications done to them to make the blower more efficient. Front bearing plate has had a strip of Teflon added to it to seal the rotors to the bearing plate and the case has been scooped out in the rear of the inlet for better airflow into the supercharger.
Top opening is 10.50" X 4.50" and case is drilled for a 13.250" on bolt center injector. Blower case is drilled in the rear 1/8" pipe for cooling nozzles and made from heat treated cast alum. that has been black anodized.
The inside of the bore looks good but does show some wear on the anodize but no big scratches or grooves.
Blower case will work with all Kobelco K-9 or K-11 blower rotors but not with any other manufactures blower rotors. Blower case overall length is 17 1/4" with bearing plate it is 18 1/4".
Note: This is a used item. This item might have been taken in on a trade. RBS may have inspected this item and deemed re-usable. There is no warranty expressed or implied with this item.