I have had a HG where it was tight enough to keep coolant frm entering the combustion chambers, but the extreme pressure of compression and combustion would indeed push hot gases into the water jacket. An absence of oil 'milkshake' is not a conclusive indication of a good HG.
Gosh- I hate to say this, but if it's really a mint 91 all-original, I think i could handle a BHG on my first day!
The 'brown and scale' tells me that oil had probably getting into the coolant for some time. I would remove the engine and do a full rebuild.
Oil pump, bearings, full gasket set...
This has got to be the longest wait for dyno numbers in history...
Aargh!
I'm thinking about buying this turbo, and I want to know how it compares to the 57 trim.
You're the perfect guinea pig.
ps- what was your numbers on the 57?
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