Did you use a credit card with Clearwater? Dispute the charge, AFTER you call Clearwater and talk to the boss first. The boss will always have a better grasp of real customer service than the phone peon. And you have a great position.

I'd tell the boss you need a new head gasket and intake and exhaust gaskets and valve cover/cam tower gaskets, and plug seals, in fact, you need over half a whole head set, less the guide seals, and you want oem. I know this board has bought at least 20 heads from clearwater in the last couple of years, and I bet this is the last one unless they do right.

I'd precede the phone call with an email to the boss to clue him in, and give him a chance to call you before you make your last call.