NEW CRANKCASE FROM BC (#420893001) - Keep your existing crankcase and save some time by getting a new BC supplied case. Features Dry Liner sleeves installed, finish bore & hone to final piston sizing, copper O-Rings to contain combustion, align hone main bores and optional drill & tap for larger diameter (10mm or 7/16") head stud holes to accommodate BC custom ARP head studs (sold separately). If not specified, case comes with stock head stud holes (9mm). Recommend Cometic MLX head gasket for O-Ring sold separately. Allow 3-4 weeks leadtime, 100% deposit required.