Thanks for the advice and warning everyone.
Well, I ran a bit more water through it and still no real change.

So, I've got the thing soaking in some MMO.
I'll leave it for a couple days, turning the motor over every day, and see if it has any affect.

Anyways, I did a compression test and here are the results:
Front rotor: ~ 90/90/10
Rear rotor: ~ 95/95/95

This was best I could see with the needle bouncing so fast! haha
If I left the valve in, I get ~105 peak on the rear rotor and ~95 peak on the front.
(Not sure if this is relevant for anything, but thought I'd throw it in there anyways.)