I'm confident that mine is cleaned out. No surprises in the res.
Also wanted to add, the Chevette core will work with 4 80mm's 98% perfectly.My rad is mounted vertical. I have 2 at the top, side by side(exact width), and the bottom one(I need to get another 80 one of these days)is just hanging over the bottom about 10 mm.
The reason for 4(ok, 3
) 80 mm's...I use quiet no name case fans. I originally tried my sunon 120, with a duct, but the temps are the same, and the noise is gone this way. The 4th fan when I finally get around to getting it is only gonna help me too.