Here's some more info. You'll see that the sizes are ranges rather than an exact number due to production variances. The #'s you find on othe sites are an average:
MM&FF January 1998 pg. 223
Cobra and HO marine p/n F1ZE AA 60.6-63.6cc
Explorer (1996-1997) F1ZE AA 63.4-66.4
Cobra and HO marine F3ZE AA 60.6-63.6
According to this, the cobra heads did have a smaller chamber. It doesn't give any means of identifying one F1ZE head from the other though.
On my heads (F1ZE AA's) The chambers were 61.1 cc's and came down to just over 59 with a .015 cut.
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393W: AFR 205's, hydraulic roller, TKO600.
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