Originally Posted by ekidman
The ticking may be associated with a leaking exhaust manifold. It would likely be right where the manifold meets the engine. My second guess would be a blown head gasket. Have you checked either of these things?
X2...A blow head gasket would be easily seen by white smoke in the exhaust, sweet exhaust smell and loss of coolant.
How'* the oil look? Milky, watered down, foamy?
With the recent over heat issue there could by any number of issues from a warped head(*), exhaust manifold leak, cracked block, intake manifold leak, etc. Let'* systematically start looking at things and eliminating them as a possibility.