Mahle Original Head Bolt Kits Chrysler 6.4 5.7 Hemi 6.4 392 # GS33429 Cylinder Head Fasteners, Original Head Bolt Kits, Hex, Steel, Black Oxide, Flat Washers, for One Head, Chrysler, Dodge, Jeep, 5.7L, 6.1L, 6.4L, Kit Fastener Style: Bolt Undercut Stud: No Head Style: Hex Fastener Material: Steel Fastener Color: Black Washers Included: Yes Washer Style: Flat Quantity: Sold as a kit. Notes: Services one cylinder head. Mahle Original Head Bolt Kits Mahle Original fasteners deliver the clamping force necessary to seal the combustion chambers, as well as the oil and coolant passages--even at extreme temperatures and pressures. On your next cylinder head reassembly, use bolts designed to exact specifications for the best sealing solution--Mahle Original head bolt kits.