Editing GM RPO build codes (section)
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==Casting numbers and date codes== {{Note1}}See the links under '''''Resources''''' for more info on casting numbers and date codes, etc. When a part is cast, the mold has a part number and a date code set so that it is part of the mold and the part is forever identified. Most older Chevy parts such as heads, blocks, and manifolds, usually have a 7 digit casting number beginning with 3 to identify the part. The date code on a SBC is typically on the bellhousing flange behind the distributor. On early big blocks, it was on the passenger side near the pan rail, but later (1970) moved up to the same location as the SBC. Usually the date is given as a letter, a number and then a number, such as B 23 3 which is for February 23, 1963. With any engine still having ignition shielding on, you have a very hard time to see the date. A good flashlight and a wire brush to clean any dirt are a must, even with the shielding removed. ===Partial VIN=== Stamped on the engine pad located in front of the right head. An engine identifier known as the "suffix code" is also stamped here.
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