I have a pair of these heads. I have a problem with one of mine. I was performing some light clean up work, like removing casting flash and some very minor gsaket matching. On one of the runners the sanding wheel went through to the push rod hole from the intake runner. I am stil meaning to send it back cause I need it. Tried repairing it with a guide but it doesn't seal properly. The holes in the head(push rod holes, stud mount holes, valve guide holes and so on) are all drilled off-center. It is pretty bad. When you get a pair make sure to check them real well. Check all the runners, make sure everything is centered. I guess my casting got shifted for one reason or another when it was drilled. I have heard of a guy going through about 6 heads until he came across two he liked. It matters if you are going to do any work to the head. You are limited to how much material you can remove if things are off centered. The seals that came with my heads are the spring type. I guess they stopped with the umbrella seals.
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