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When you are through with this exercise...there is no reason for those to leak ever again.
Put in Brass plugs..
clean the surface on the block that they are in contact with very well...
and put a good Aviation Gasket Cement on both the block and the edge of the plug...
then use some kind of jig which will allow you to knock them in straight AND which will seat them at the proper depth... but not more.... and no do overs.... if you get it in cross threaded so to speak... take it back out clean it and reinstall straight in....
Can't rust... insulated by the cement... should never have to worry about them again.
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