... .Aluminum cylinder block 3.ISO9001:2008 Cylinder block design for 168F aluminum cylinder head.We are a ... ,SKD61,45#steel,etc.Heat treatmentHardened,NitridingHardnessHRC50~55Mould featureAdvanced design, Novel structure, High precision, Quality materials, Long lifetime ... . Ningbo HONGXIANG Mold Machinery CO.,Ltd want to finish some die casting projects with you together perfectly. cylinder block design