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if you go to the the pic of the valve train off to the left where the heat riser is you see what looks like a stud and some thing made to fit in where the casting would be open, what is it a mod for the heat riser?? or what.. anybody..https://www.ebay.com/itm/1962-Buick-Skylark/133649744678?hash=item1f1e254326:g:uaYAAOSwMolgEhCw