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Blowing out the holes with compressed air is not good enough ...by a long shot...
You need to get two taps for those holes.... proper size of course...one regular and one bottoming ... used last..... then put heavy grease on the tap.. or you can also put a stick of candle wax into the hole and then run the tap in.. this will both clean the threads... very important for getting proper torque readings on the head bolts.. and take all the junk out of the hole.. I think there may be an advantage to using a ' gun or spiral flute ' tap ... or they make one which does a better job of expelling the wax... this is much faster than the perfectly acceptable way of using heavy grease to catch the junk and bring it back out through multiple insertions... cleaning it carefully between each procedure....
... What is that saying ..." pride goeth before the fall " ?
If you have any doubts go to Roy....you have a LOT invested in many ways... no time to mess up at the very last..
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