Cummins Gasket Set – Upper Engine 4B 3.9 / QSB 3.9 / QSB 4.5 / B4.5c Part: 4089648

We at Big Bear Engine Company come from a background of nose to the grindstone machine shop work. We value your time and know you need to get back to work quickly.This particular part number: 4089648 from Interstate McBee is of the highest quality and will always ship in a timely fashion.