I didnt think it was enough of a difference to say, but your right. Stock gt40 heads are 65cc and cobra heads are 62.5cc.
The complete story on these heads can be found in Ford's "Mustang 5.0" book by Al Kirschenbaum.
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I didnt think it was enough of a difference to say, but your right. Stock gt40 heads are 65cc and cobra heads are 62.5cc.