My oil burning pig. Pics too!

Gotcha. Well, the porting enlarges the intake ports so big that on the inside top corner, it breaks into the drilled, tapped hole you screw your valve covers onto. Problem is, the valve cover bolt doesn't go that far down and even if it did, it would probably still leak.

On my heads there was basically a "hole" between ports.....if this makes any sense to 'ya.
Once everything was all buttoned up and running, not only was I sucking oil and oil vapors from the screwhole into the ports, I was also sucking air from port #3 when on the #1 intake stroke and so on......sort of 8 little vacuum leaks I guess. 1&3 5&7 2&4 6&8 were communicating to put it bluntly.

All is well now with the heads. My guy even flowed them for me and they flow very close to the advertised numbers. The velocity on "the short turn" was also pretty good. "not great" but pretty good.

Sounds like it would stick out like a sore thumb, but really, it was easy to miss.