SIR rods are economically priced and offer an alternative to the time and expense involved in reworking OE rods. Forged from 5140 steel, SIR rods offer 50% greater strength than the GM Pink rod. Each SIR rod undergoes a rigid inspection process to insure quality and are shot peeped to stress relieve the metal. SIR rods feature ARP 8740 Wave-Loc Bolts. Packed in weight matched sets.