There are mainly two configurations to the 4A-G cylinder block with some minor variants with the five vale variations. In all situations they have these attributes in common. The cylinder block on the 4A-G is product of Forged iron alloy. There are five key bearings held with two bolts each https://edgarfjjhf.wizzardsblog.com/26817935/toyota-4age-for-sale-fundamentals-explained