George,
Beware of the reproduction heads - I understand those made in Europe are ok but the Indian parts look good but are porous & laminated castings. I have an extra OEM 5 rear head that has been milled .060 to clean it up. PM if you are interested.
I was told by experienced HD mechanics that the aluminum heads used the asbestos fibre gaskets & the iron heads used the copper gaskets. It seems it is a heat transfer situation. I used NOS fibre gaskets with good success.
Jack
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