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the casting #s on the heads are c6ae, i have been searching the net all morning and havent found anything
 

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They are probably 54cc but could be as low as 49-50. My Shelby heads are only 49cc. I think that Ford listed those heads as 54cc nominal in the original specs. I may be remembering incorrectly here but someone will correct me if so.
 

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Are you sure that's not "C8AE"?

Tom Monroe's book doesn't list a C6AE head.

And there should also be another letter by itself under one of the intake ports.
 
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