I've been looking around at heads, and prices vary from under $400 on Amazon to the Clearwater $530. Are there differences that make one better than the other, or do they all come from China?

From what I can determine, I have the jet valve, hydraulic valve head, but it is still on the engine. It think that is what came stock in 1987. So you believe the new head from Clearwater is a bolt on?

Thanks