Find answers to Frequently Asked Questions for First Generation Firebirds that have been asked and answered on FGF. Special thanks needs to be given to all the FGF members who took the time to respond to other member's questions.
Engine - 400 Specific
Q: Engine Codes
I am currently in the process of having my engine for my 1967 400 Convertible rebuilt. The mechanic has cross-referenced the (YD) code to a 1967 400, but it says it is a 2 barrell, and my engine has a 4 barrell. I am unable to find a cross reference for the engine code under the 1967 sectioin of this site. I do not see the letters referenced in this section. Can someone help me?
The code on the block is: 0081718 YD
Also stamped is: 20P105982
A: The 20P105982 is your clue to what that engine really came from. The first zero means it’s from a 1970 car, and the letter “P” means it was from a car built at the Pontiac assembly plant, where that year they were building full-sized cars like Catalina and Bonneville. The YD for that year indicates a 2 barrel 400, 290 gross HP from a Pontiac, meaning big car. Although the chart I have says a 10.0:1 compression ratio, it does not say what head cast numbers were used.
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Content last modified: January 24, 2014 at 9:41 pm
Q: 400 Engine Block Code for 1967
I’m trying to decipher a code cast into the block on my 1967 firebird. The code is located near to where the distributor fits into the block. I think it is the cast date of the block but I would like to know for sure. The code is 86133. (As best as I can tell).
I know this isn’t the sequential build number, (serial number), of the block since that is locate on the front on the block on the passenger side of the car.
I’d appreciate any information you can provide.
A: That is the blank block casting number. It’s like a part number. According to my info the whole number is 9786133. This denotes a 1967 400 cid block. I got the info from a book called Pontiac Muscle car performance 1955-1979 by Pete McCarthy
Any proposed updates, changes, pictures, and/or corrections, please use our comment section below (may need to click on permalink to access comments feature). Information is subject to change and offered as is without any warranties or guarantees. Please review our Term's Of Use for more information.
Content last modified: January 24, 2014 at 9:41 pm
Content last modified: September 15, 2023 at 11:15 am