One last nagging question before i button this fucker up…again

Going over the last year in this as close to proper sequence as i can recall.
Typing it all out helps me get my head around it too.

History:
Had a shop rebuild the top end with new valve job, guides and seals, bottom end got new crank/con bearings last year.
Rebuilt top end, fried ECU, replaced/repaired ECU.

So after the motor was started up it smoked burnt oil pretty badly.
I pulled the motor, after doing a leakdown test indicated possible failing rings.
A compression test at the same time looked very good.

On the tear down, I found fresh burnt oil in the exhaust manifolds of a couple cylinders, that kinda
made me think it was actually the rings, so i plowed on ahead and disassembled
the bottom end again and installed new rings and honed the cylinder walls. Then let it sit…for months
while i cleaned and rebuilt other things on the car and fought water leaks in my other Z.

Now i'm putting it back together and notice yellowish oil staining in the intake side of a few ports
as well as the burnt oil on the corresponding exhaust port and fouling on the exhaust valves.

Could it be the wrong valve seals were installed? Could the rebuilt turbo have been leaking oil?

I built a vacuum plate and pulled and held a consistent 25 Hg of vac on the intake and exhaust ports,
so that would indicate the valve job was good, and possibly the seals. But if the valves were sealing good
the seal above it could still be bad…possibly?

I reassembled the bottom end (months ago) and top end (over the last few nights).
New Victor Reinz head gaskets, intake gaskets.

Must be the turbo. It came as a spare with my AE and had been rebuilt.

I took that apart last night and it's spotless on the compressor side, no oil. plus none in the charge pipe or TB
where it would normally be found. Shit, i just installed the heads on the block.

Back to the valve stem seals. Maybe they installed the exh seal on the intake.

Pulled #1 intake valve spring last night and the seal looked good and was the correct one.

I haven't pulled the exhaust seal yet, but will tonight.



I get that if the exhaust valve stem seals were bad, there would be oil in the exhaust, and i found dark staining on the exhaust ports
but then i also found a bit of light oil staining on the intake side. Not sure if bad rings would allow oil in the intake, since it is sealed
from the compression.

I purchased some federal-mogul valve stem seals and i'm going to go ahead and replace them before i reinstall the motor.
Its a pain with the heads on, but worth the insurance.

Is there anything i could be overlooking? Worrying too much possibly?