Just a few points: Last time these heads were like 3500-4K, and I can't imagine them being even that cheap what with the changes in metal prices etc. Even Mike Kirby himself told me that for 500hp and below, a lump ported head with a power adder is more cost effective (and 500hp is a lot of motor for most of us). Remember you have to get specific intake manifolds for these heads and IIRC some valvetrain components are different as well but don't quote me on that talk to Mike. I believe these were engineered for BBC rockers. I think you have to budget 6K just for the topend to go to one of these. I want one bad, but just can't do it. I've got about 8k in my whole engine starting from scratch with plenty of aftermarket parts. I think these should be part of any max effort build; your engine is only as fast as your cylinder head. They are awesome, but the cover charge is steep to get into the party.
