Quote:
Originally Posted by Steve Barcak
The next obvious question about these special, custom heads would be..... are they alum? Could be painted. Wouldn't that be a nice find today? though they are probably still small valve with the early, narrow spacing. hmmmm
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Yup...probably some variant of what became the production 421-SD head, albeit with angled plugs. Makes one wonder if the plugs were changed if there were any other chagnes done to the combustion chamber.