Genuine OEM Solid 8 Groove Pulley 3918275 3925852 For Cummins QSB QSB4.5 Engine. ● Manufacture Part Number: 3918275. For Cummins 6CT 8.3C ISC QSC 4B B3.9. 1 x Solid 8 Groove Pulley. International transportation services are temporarily not available.