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?
Just torque the HG as per the ARP installation instructions.
Get a thermostatic oil cooler setup.
Shim oil pump while you have the chance, and replace the piston squirter bolts if the internal springs are weak at all.
I've had a BHG where the cylinder pressure would leak into the cooling passages, but no mixing of oil and coolant, and no reverse of coolant into the combustion chambers.
I think he means .001x inches clearance, vs. .002x inches clearance.
Sometimes, you have to file your piston rings and adjust your piston to wall clearances a bit wider for higher HP goals too.
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