Sounds childish, but thats all I can come up with after $%&ing with these things for so long. Alright, I'm instaling my engine and the dang exhaust manifolds woun't bolt up to the heads. they are too short. Had to make a tool to pry the sides apart to get the bolts started. Oh well, just glad I didn't strip um and have to take the whole thing back out again. Sorry, just needed to vent.