I have owned 440-1 and 572-13 Indy heads. The Original B-1 will make more power than any Indy Head on a 4.800 bore space..

Give Tom Hemphill a call 724-639-9924 Tell Him Mark sent ya.. He is able to make billet heads. I have watched him make a billet B-1 head and he can alter the port however you want cause hes starting with a solid chunk of Aluminum.. He is in Clarksburg Pa