In 1970 the 350 and 455 had their size cast in the side and a 50 or 55 in the lifter valley.
The 400 also has the 400 on the side and 00 in the lifter valley, but not until 1971.
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Casting codes for from 1964 to 1967 are found on the distributor pad, except the 421′s.
Casting codes for 1955 to 1963 are found on the passengers side of the block.Making it very difficult to install in to a GTO/Tempest. This was used to ID an engine when it need to be “transferred” to another line for additional machining.Freeze Plugs: There were only two freeze plugs from 1955 to 1966. Date Code: The date code is cast on the distributor pad. Note: The 1973 SD 455 did not have the transfer lug while the 1974 SD did.The casting code will help determine what the block is.The block code was used to ID what application the engine was to be used for. Vehicle Identification Number (VIN): The block VIN and the vehicle VIN were the same, but by late 1967 the block VIN was revised.