I have a set that are the HP heads. They are ported with stainless steel valves and roller springs. On a 11.0 to 1 440 in my 74 Challenger it ran 10.50 at Gainesville. Less than 5 passes on heads. Went to a 505 with Indy heads. $650.00 plus shipping. I also have a set of nice bare castings that...