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frost/core/freeze plugs are installed with a driver that sets the lip slightly under the block face. There is nothing wrong with the rubber expansion plugs if you install them correctly. They should barely fit uncompressed (get the right size) and you should only tighten them down per the instructions, I think 2 turns or something? Anyway, they are a lifesaver when the plug is behind a starter or manifold and your in Autozone parking lot 90 miles from home.
 
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