I've got a set of ported iron heads with big valves that have been run about 1500 miles since being worked over and set up by Weber. These are set up for a roller cam and have been machined for the Harland Sharp roller rockers that can be had also. Fall of 2014 I ran 10.1 @ 132 mph at 28 # with these. Last summer I upgraded to a set of Champion aluminum heads. PM me for more info if interested.