About 2,000 different numbers for most kinds of car&truck&industries. We supply our parts to local OEM and overseas aftermar ket with OEM quality control. Intake valve material is normal 4Cr9Si2 or 4Cr10Si2Mo,Exhaust valve material is whole 21-4N or 21-4N(head)+4Cr9Si2 stem. Valve stem diameter tolerance can be within 0.015mm,Valve stem roundness can be within 0.005mm. We passed ISO9001 certification
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