This video demonstrates a specialized machining process to install dual spark plugs into Holley heads, a modification aimed at improving fuel combustion efficiency. The presenter, Dragonman, details the steps involved in precisely milling a new seat for a 9/16-14 millimeter spark plug, drilling the hole, and tapping the threads. This technique is presented as a solution for engines running on high-methanol fuels that can lead to carbon buildup.
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