View 2 Photos View 0 Videos GMC 6.6L DURAMAX Engine Part for a GM 6.6 DURAMAX $100 USD Good used, cleaned and inspected GM 6.6 Duramax coolant neck with thremostat housing. Part number: 12642719. ConditionUsedFits To Make(s)GMFits To Model(s)6.6 DURAMAXPart Number12642719Stock Number1068773 MLS Number14095044CategoryEngine Miscellaneous Parts Last Updated1/16/2026 LocationFitchburg, MA, US Sold ByRydemore Heavy Duty Truck Parts (888) 519-___ SHOWNUMBERCall Seller Email Seller Save More Info