What's your thoughts on a newer head? One that would already have unleaded compatible seats?
I know that when I had the head on my truck motor thru the machine shop, a head that I had a set of oversized valves put into, I specifically requested new seats be installed at least the exhaust side. When they called me claiming it was done, I asked again if they cut the head for, and installed new valve seats they tried to tell me they'd be "fine" without, even though they cut them for oversized valves. I'm sure there couldn't have been much if any of the original induction hardened material left after being cut out for those valves. They weren't happy about it when I said id pick up the head after they put the new seats in as I had requested. I got that call about 2 days later. Said he had no problem getting them from his warehouse.
This was a couple of years ago. 3 at very most.
