T-Bird 390 or 428?

:welcome: Look on the right side of the block towards the front. The casting # should be there. Cole

Thank you for replying, as I said this might be a silly question but once I find the number how do I know which one it is? Or, does it say the number specifically?

In 1966 that would be

Zooie said:

Hi, I stumbled upon this site trying to learn how to tell what kind of engine is in a friend's 66 T-Bird. Anything would help, thanks.

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Zooie said:

Hi, I stumbled upon this site trying to learn how to tell what kind of engine is in a friend's 66 T-Bird. I am super ignorant of the subject so please excuse me in advance for anything silly. I found a similar question here and the answer seems to be much more complicated than I had expected, but I would really appreciate it if someone could help guide me in the right direction. Anything would help, thanks.

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Ford FE casting numbers are not nearly as helpful as Chevrolet's in narrowing what you've got. The regular production 4, 4.05, and 4.13 inch bore engines are all doable on the same block castings. So often, with them, you just have to pull a head and measure the bore and stroke to see what you've got. Much, but not all, the high performance stuff gets into unique casting numbers, so the 4.0, 4.05, 4.13 bore 352, 390, 406, the 4.23 bore 427s, and 4.13 bore 428 Cobra and Super Cobra Jets show unique numbers that make ID pretty easy for them.

If the engine is still in the car and the car has its production ID tag look at the Engine Code. Code Z is the base 390, while Q is the optional 428 for the year 1966.

Bogie