I have a set of 906's that were done by Nick Wilson at Comp U Flow for sale. They have new bronze guides, 928 springs, stainless valves, 10 degree locks and retainers. They flow 258 intake and 214 exhuast on Nick's conservative flow bench. I have the flow print out. I had them on my 470 Stroker at the end of last season. Ran 10.96 at Norwalk with them. I'm changing over to 440 Source ported heads next week. If your friend is interested in a nice set of heads call 740-264-9855. I'm located 30 miles west of Pittsburgh, PA.