I have a set of turbo 3.8 litre heads built by famous Buick turbo engine builder and GM engineer Doug Roe. He worked with Smokey Unick on many projects. These iron heads look like the turbo castings but have no casting #'s on them. Maybe prototype ones from Buick. They have been ported, roller rockers installed , pushrod guide plates, stud girdles and double valve springs. Own a piece of history with this pair of heads. $700 obo. Call for details I won't be back to my computer till tonight. Paul 480-221-9572