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This has been talked about before..
but on the holes in the block ( all ,not just the main head bolts,there are 3 or 4 smaller ones too I believe )... should have nice new clean taps run into them..
THIS IS CRUCIAL FOR GETTING CORRECT TORQUE READINGS AND GOOD EVEN SEAL ON THE HEAD GASKET...
Torquing bolts is just an interpolation between the resistance measured by the torque wrench and the amount of ' pull down' the engineers want to have on the head..
Thus all the holes need to be absolutely clean ...no nothing else...and newly cleaned threads......
If there is stuff in the block holes (even just corrosion ).... one way to help it out is to put wax on the tap... and I believe a spiral ' gun tap' design may help on that ( subject to revision )... normal procedure for cleaning out a hole uses TWO taps... the regular one...and a Bottoming one... so if you do it right you will have some tedious but well worth it time on those block holes..
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