You'll find basically two configurations about the 4A-G cylinder block with some minimal variations With all the 5 vale versions. In all scenarios they have these attributes in prevalent. The cylinder block on the 4A-G is made of cast iron alloy. You'll find 5 major bearings held with two bolts https://4age20v14567.sharebyblog.com/26673620/blacktop-20v-4age-secrets