The reason I thought polish was bad because the polish particles fill the voids where the thermal paste would sit. It probably doesn't make a substantial temperature difference, but I think it would cancel out any gains from lapping it. Make sure you clean it really well before mounting it. You want as much of that polish off of the block as possible.
I took allot of pictures but forgot to take a picture of the after lap job. This is a trial run I am sure it will be apart again. I would like to flush the system and tweak on the hose lengths a little.
there is no reason to use brasso or any metal polish at all EVER
the idea is for the block to be as flat as possible and the polish can get into the micro groove layer where it would be even less efficeint that thermal compound
Agreed! The process was taken from the factory lap straight to 2000 grit. Then I used some car scratch remover wiped with alcohol. Then brasso polish. I was board during testing. There was polish there was the water block. I had to bring to two of them together. Mirror finish!!!
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