... QC management 5.OEM and ODM service 1> Connecting rod Material: 40CrNiMoA(4340) Forged Steel.2> Hardness after quenching and tempering is ... possible.6> Sets weight matched to +/-1.5 grams.7> Supply racing connecting rods for Volvo, Opel, Toyota, Nissan, Ford, BMW, Mitsubishi ... OEM service..For more information and specification,please contact us. forged 4340 steel Chevrolet 6.385" Connecting Rod