Richard;
...a bit late to the party, but I'm happy you got this sorted enough to make it home...it is not clear to me if Tstat housing itself is fractured or if gasket around Tstat somehow failed, or what the precise manner of failure was (remember also for future minor Cooling System failures, that simply removing the Pressure Cap is sometimes enough to stop a pressure leak, and allow continued driving - while monitoring engine Temp carefully)
...in any case, be advised that the rubber gasket sits around Tstat and is preloaded to seal by the recess in Tstat housing...there is NO further gasket required (or should be installed!) between Housing and Cyl Head...in fact, installing one would decrease the preload and intended sealing ability on the rubber Tstat gasket, so don't install one! Do however tighten the Housing securing bolts evenly and don't overtighten, as the cast Alu Housing is brittle and can easily be broken in this manner!
Cheers from Connecticut!
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