Cummins AR60740 Heavy Duty Diesel Engine Assembly Kit is a Cummins-branded kit designed for engines with a 4-5/8 inch bore. The bore specification is 4-5/8 inches, which defines the correct fit for this AR60740 assembly kit on heavy-duty Cummins diesel blocks. Part number AR60740 indicates the kit's configuration for rebuild or assembly work on Cummins heavy-duty diesel engines built around that bore size.
