1971 455 GTO Help with engine codes - Pontiac GTO Forum
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post #1 of 2 (permalink) Old 09-20-2014, 06:20 PM Thread Starter
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1971 455 GTO Help with engine codes

Trying to help my son sell his 71 gto and need to make sure I'm listing the car correctly. Looked up VIN# and it's a 71 GTO automatic made in Atlanta. My problem is the engine, and making sure it came with the car. I have the YC under the numbers 402775. The intake numbers match to a 71 455 auto trans. How do I find out the year of this engine and if it was the original? and which horsepower block we have .......Thanks eveyone
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post #2 of 2 (permalink) Old 09-21-2014, 11:41 PM
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If it's the original engine, the serial number portion of the VIN will be stamped into the block --- down LOW, passenger side, running next to the timing cover. (Not the 402775 that you found underneath the YC).


The last photo on this page --> How to identify your Pontiac engine
Shows where to look.

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