What other mods needed with ported heads to get the codes cleared?

[jimtash]

Check your ground at the center of the intake valley, as that controls the O2 sensor heaters, I had that issue where the CEL would come on and go out, and in the end it led me to that I had no ground for the heaters, causing the O2's to cool off, going lean, fixed that problem and my CEL went away

That's what it was. I looked closely in the valley and there they were, two loose ground wires. I bolted them down and no more codes.

I also used new intake bolts and did everything in sequence including the clamps. It runs good.

Thank you for your post. And I want to say thanks to everyone else as well.

 

[SHOtime2511]

The dead give away for vac leak is the lean code for both banks after a top end service.