Ken Crocie turned me on to this in the mid 1980s. As stated earlier, H-O plug sets came with the 5/16" plug pre-drilled. It serves two purposes: 1) Provide extra lubrication of the distributor gear 2) Helps stop the sediment that can block the RH oil gallery.
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“It takes considerable knowledge just to realize the extent of your own ignorance.”
Dr. Thomas Sowell
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