TD42 ARP head studsCylinder head stud, washer and nut set by ARP to suit Nissan TD42 series. These studs will help gain the increased head clamping required in performance applications. They will achieve a more evenly distributed and accurate torque load compared to that of head bolts by eliminating the twisting force created during tightening. This ultimately translates into higher reliability and a lower chance of head gasket failure (ARP brand made in USA)