6CT8.3 Cummins Exhaust Valve 3921444 Parts Catalog Ref No. Part Name Part No. Required 1 Pipe Plug 3008464 1 2 Pipe Plug 3008466 1 3 Sealing Washer 3902425 2 4 Fracture Resistant Screw 3917729 12 5 Cylinder Head Gasket 3938267 1 Cylinder Head 3939346 1 6 Valve Collet 3901177 24 7 Exhaust Valve 3921444 6 8 Intake Valve 3924492 …