Wow how familiar that sounds, mine is almost exactly the same but I pushed a bit further until loss of power occured.
If I were you I would get a new core, these heads are like play doe after they have gotten hot so even when you hardness test them they can still fail shortly after changing the gasket again.
You could have an internal crack which is pretty common with them as well where you can't see it without stripping the head down and vibration testing it with graphite dust.
There are some reasonably priced bare cores on Ebay at the moment from someone in Ballarat I think which would be worth a look.
Oh and change your head bolts.
Cheers Casper


				
				
				
					
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