I would take it off, lap it to 600 or 100 grit (their are big debates about what is better, so it is up to you, but generally, higher is better) then remount it, and make sure it is quite secure and has a good amount of pressure (Off the top of my head, the amd's need 50 psi, but I have a feeling that, that is too high, so please don't quote or flame me).
also, make sure you are getting a good flow rate (it should be moving at a good speed when it makes it back to your bucket)... the heater core may be a bit constricting for that pump, but I have no experience with rio's.
-WireX
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