6=1966 E = May 25 denotes the day of the month. A bright light source is essential and you will likely have to wipe the area clean as well to be able to see the engraving.
#66 thunderbird radiator driver
A small mirror taped to a long screw driver can be prove helpful in being able to see the date code engraved into the flat boss on the left of the block. I have to say this can be difficult to see when the engine is in the car. This is located above the oil filter adapter on the left side of the block just below the exhaust manifold towards the front of the engine. It would be more prudent to check the date on the engine block when trying to determine if the engine is original to the car. See your DATA PLATE for your scheduled build date. A date code found on any component should fall within a production "window" of approximately one to six weeks prior to the scheduled build date of your Thunderbird. The first two characters are really all you need to know to determine if the intake is original to the car.
With a full range of part numbers to fit most GM vehicles, ACDelco Professional Radiator Caps offer. The date on my intake decodes as follows 6 = 1966. 7.88 - 16.49 ACDelco Professional Engine Coolant Radiator Cap 1 71649775 Ford Thunderbird 1966, Professional Engine Coolant Radiator Cap by ACDelco.
The date code on your intake manifold is located under the carburetor accelerator pump on front of the carburetor. Therefore we already know your intake manifold is a 1966 part. The first two characters in the number prefix, C6 = 1966. The full engineering number should read C6AE 9425 - G. The C6AE on your intake is NOT a date code, it's the first portion of the engineering number. You will need to locate the proper ones for both sides of your radiator. Yes, the side aprons used with the larger capacity radiator are necessarily "taller" than the standard ones.
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