Indy Head information
Those are definitely early INDY "SR" castings, basically true to the original "Zeeker" patterns when INDY first screwed the poor guy. Fore-runner to the later EZ.
If I had a nickel for every set of those I Sold and Ported back in the 90's as an INDY Dealer here in Canada, I would be rich !
Bob @ rmp Racing Engines, Jaffray, B.C. Canada.