Mercury - Quicksilver 816608Q78 Red Wire Spark Plug Wire Kit MerCruiser Black Scorpion Tow Sports Engines Delco HEI Ignition 816608Q78. Overview. The Quicksilver 816608Q78 Red Wire Spark Plug Wire Kit keeps your MerCruiser Black Scorpion tow-sports engine firing strong and running clean. Built for V8 GM-based marine engines with Delco HEI ignition systems (1997-1998), this OEM wire set delivers a sharp, reliable spark and the durability you need for hard-pulling performance on the water.. Each w