I'm getting 4 to 10 degrees of knock retard on my Scanmster @ WOT after I seafoamed the engine. I have no clue what's causing it?

 

Well, you didn't include a sig or any info whatsoever about your car. My crystal ball is foggy today, so some info about your ride/mods would be a good start.

 

Flowmaster exhaust
Hooker longtubes no cats
A4
New OVC wires
New opti
New plugs

Nothing major Anything else

 

Do you have an LT4 KM?

 

Yes I have LT4 KM. Forgot to add that.

 

Run it with race gas to see if the knock goes away; if it doesn't then you've got false knock. Brett Fraker's website has a link to installing a knock desensitation circuit to help with false knock.

 

What if it's real knock? What would be causing it?

 

up

 

If you are running the stock pcm tune, there's a minimal chance that you are facing a real knock issue.
Anyway, a knock will occour with a lean condition and/or excessive timing advance. Theoretically, if you have bad plugs/wires, or suffer from lean condition (fuel pump/filter/pressure regulator/injector failure) you could be detonating.
Good luck