Mercury - Quicksilver 816608Q68 Red Wire Spark Plug Wire Kit GM V8 Marine Engines Delco HEI Ignition 816608Q68. Overview. Strong spark starts with solid connections. The Quicksilver 816608Q68 Red Wire Spark Plug Wire Kit gives your GM-based V8 marine engine the clean, consistent ignition it was designed for. Built for Delco HEI ignition systems (1993-2010), this complete set of eight red wires delivers reliability, endurance, and a bold OEM look under the cowl.. Each wire is precision-cut for pe