All the Model T vendors sell Aluminum heads but I've never seen a finned one. Most of the finned heads were for V-8 flat heads I thought. There are some other finned aluminum accessory covers that are finned for a T engine.
Thanks for the feed back.
I have come to the conclusion that currently there are no "finned" heads on the market.
I have purchase a low/high compression head from Langs.
Thanks again