Now I also have quite a few people ask me for clarification on Engine Numbers for their specific year. I have put down the main engine codes here, but there are more, I just put down the most popular. I have most of the years here from 1967 to 1981. I have listed the Pontiac 400's, Olds 403, etc. for the Pontiac Trans Ams, Firebirds, and Formulas. When looking at the engine, at a quick glance, you can notice the difference between the Pontiac 400 and the Olds 403 because the Olds 403 has the oil filler tube located at the front of the engine.
On the Pontiac 400 or 455, you can look on the passenger side of the engine block, just below the heads for the engine code. And on the same side, real low on the block would be the VIN number. Now, the VIN number stamped on the engine will not be the full VIN number. It will be something like "28L111111". So, it will have a "2" for Pontiac, an "8" for the year built, an "L" for what plant it was built at, and then the "111111" would be the last 6 digits of the car's VIN number. If you look at the bottom of the engine, you will see a 400 or 455 casted into the block which can tell you at a quick glance if you have the Pontiac 400 or the Pontiac 455.
Here is a good shot of an engine out of the car to see it better.
On the Olds 403, on the drivers side of the block just below the heads located behind the power steering pump is the VIN number, and on the top of the engine behind the oil filler tube is the engine casting code.
I had alot of help from various web sources and from the Catalog of Firebird ID Numbers 1967-93. Also, the Parts and Illustration Catalog from Pontiac.
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