Features precision-rolled threads for optimum engagement, to prevent galling and promote more consistent torque loadingWide underhead flange design provides even load distribution for optimum sealing of surfaces - preventing leaksTensile strength rated @ 170,000 psi superior and stronger than OEM and stronger than grade 8 fastenersManufactured by ARP® to Feuling's® exact specificationsIncludes moly assembly lubricant for installationQuality 12-point heat-treated stainless steelMade in the USANot for '23 models with 121'' VVT motors.