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The pitting is caused by a combination of two things...
1) (Hot) coolant from the coolant passages promote corrosion.
2) (Hot and corrosive) gases from the combustion chambers.
It's normal.
It's important to get the grooves cleaned as much as you can.
I like to run a small, flat screwdriver in the grooves.
A larger jewelers screwdrivers work nicely here, but it hurts your fingers if you do this a lot.
The seals + sealant (Hylomar has been already mentioned) takes care of sealing very well.
As for "hot tanking", it's dunking the parts in a very hot solution of cleaning chemicals.
Whether you know it or not, most metals are POROUS.
If you don't believe me, torch the irons - you'll see oil seep out of the metal!
(The stainless steel "sleeve" on the rotor housing surfaces are notorious for this.)
The hot tanking cleans the oils and crap that have leeched into the metal itself.
This promotes better sealing with all the seals and sealants.
This is not necessary, but if you can do it, go for it.
Quick & dirty option is to shoot the irons down with BRAKE CLEANER (NOT carb cleaner, as carb cleaner still leaves a residue, while brake cleaner does not).
-Ted
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