ARP Head Studs w/12-Point Nuts for Nissan/Datsun 2.0L (RB20DE/DET) & 2.5L (RB25DE/DET) Inline 6. RP's Head Studs are used by virtually every top professional engine builder. These head studs are manufactured to exact tolerances, heat-treated, centerless-ground and thread rolled to ensure consistent clamping force strength and durabilty.
