You can find basically two configurations around the 4A-G cylinder block with a few slight variants with the 5 vale versions. In all scenarios they may have these qualities in common. The cylinder block about the 4A-G is made of Forged iron alloy. You can find 5 main bearings held https://toyota-4age82580.bloggosite.com/32975138/blacktop-20v-4age-secrets