Mercury - Quicksilver 816608Q70 Red Wire Spark Plug Wire Kit GM V8 Marine Engines Delco HEI Ignition 816608Q70. Overview. A strong, even spark keeps your boat running smooth and powerful - and that starts with quality plug wires. The Quicksilver 816608Q70 Red Wire Spark Plug Wire Kit is made for V8 GM-based marine engines (305 and 350 CID) running Delco HEI ignition systems between 1995 and 1998.. Each wire is built for precision, cut to the exact length for your setup, and finished in a durable