Carrillo Pro-H Connecting Rods w/ 3/8" WMC BoltsCarrillo uses proprietary chrome, nickel, moly, vanadium alloy which meets all VAR (vacuum arc re melt ASTM standards). The heat is validated, both by the supplier and an independent metallurgist whom confirm the desired physical and chemical properties of steel. All heat treat processes are via a mar aged operation, resulting in UTS of 195,000 with a yield of 182,000 while maintaining the critical elements of low notch sensitivity and ductility. All