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ARP head stud kit for the 2017–2021 6.6L L5P GM Duramax supplies heavy-duty studs and hardware specified for high-load diesel cylinder head clamping. The kit uses ARP's Custom Age 625+ fastener material noted in the description, delivering stronger clamp capacity than typical OEM bolts. It provides a direct fastener upgrade for Duramax owners addressing head retention and reliability.
ARP 17-21 6.6L (L5P) GM Duramax Diesel Custom Age 625+ Head Stud Kit
