I had a set of these heads. Eddy RPM's bought from Indy with Indy parts. I bought them because Indy sold them cheep. I would not do again. I had the heads looked at by my machinist and he told me the parts Indy put in the heads were not quality pieces; You get what you pay for. I had to get new valves, springs, retainers. Additionally the valve job Indy did was not as good as I was lead to beleive.