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Brent:
I did this on my 289 block. You'll need to tap all the holes as far as you can, being carefull as the tap will contact the cylinder walls, stop turning and go to the next hole. After all holes are done cut a few threads off the end of the tap with a thin abrasive wheel. Then go back and continue tapping each hole. The finished tap size & depth will need to be continually checked with the screw in plugs. If you get the holes too big the plugs will fall inside the water jackets. (not good!) If you ar planning on removing the plugs, mark each plug for its respective hole as they will all fit differently due to variences in the plug threads.
Rick
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
Last edited by Rick Parker; 07-18-2005 at 12:35 AM..
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