Great post!!! My 605 b1/mc motor is being built by mike and eric. Hopefully it will see the dyno next week. I chose the b1 stuff because i called and emailed indy to ask a few q's about there heads and never got a reply! The head castings themselves are cheap through koffels. Its the finishing part that costs the $$$$! And in my case custom pistons had to be purchased anyways as soon as it hits the dyno i'll post some results!!