Besides keeping the air away from the fittings? Probably none. But if you like your pump wouldn't it make sense to keep the air away from it and any chance it gets back to your pump to zero percent?
Lemme sum it up like this, when I lapped my H50 I could hear the liquid sloshing around inside the Radiator. You'd NEVER hear it(or wouldn't be as loud) if the air inside the system was minimal.
Speaking of lapping the pump. For anyone trying to do this, I suggest holding the Rad up with your weak side arm. Then with your strong side let the weight of the pump do the "lapp", as all you're going to do is make sure that the pump doesn't rock. It's going to do it anyway, but the idea here is to keep it to a minimum. If it does it once then stop, rotate the pump and continue. The pump is already pretty flat. The lapping of it however brings the scored material up because you're shaving the unscored material down.
A good way to do this is to use a slight amount of water on the paper and instead of cross sanding performing figure 8s' and circular patterns with the pump. Hope this clears up any issues one may be having lapping the pump.
I may put a small vid together detailing this but I would have to pull it all back out of the 932. Speaking of which again, I got 3 of my bolts shortened and the optical drive just fits under them. So when my bro gets back I'll shorten the 4th(if he hasn't done so yet) and then prep the bolts for paint. Then I'm done with that and ready for my Board to go back in whenever it comes back.
Originally Posted by PyroTechNiK
Is there any benefit fitting it down?.