massive reconfiguration time again.

Cudafever said

Make sure you don't have any exhaust leaks at the header and collector area on the o2 sensor side.


When you pulled the heads. was there carbon on the intake valve stem.
A leaking valve guide and short runs would show the oil on the plug but not so much on long runs as it would burn off.

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That's been a few years since the heads were off. At that time the heads had about 9-10 months since a total rebuild. 596 heads. I took the heads off and ported for a few days (under shop instructions). They did a couple hours of touch up and put in 2.02's. Oil leaking in all 8?
I haven't heard any leaks...