The 47 heads are listed by Pontiac as 72cc I’m surprised they checked 80cc they are usually a little closer to 72cc. I have a complete 69 350 with the 47 heads if I get a chance over the weekend I might check them. Unfortunately 350 engines are scrapped more than they are saved I have had this one for sale for a couple years for $200 and can’t move it or had any interest at all in it but can’t bring myself to scrap it either.
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