Mercury - Quicksilver 816608Q71 Red Wire Spark Plug Wire Kit GM 350 CID V8 Marine Engines Delco HEI Ignition 816608Q71. Overview. When your engine starts smooth and pulls strong, it's a sign your ignition system is working right - and that starts with solid plug wires. The Quicksilver 816608Q71 Red Wire Spark Plug Wire Kit is built for V8 GM 350 CID marinized engines running Delco HEI ignition systems (1995-1998).. This OEM kit includes a full set of eight red wires, each pre-fitted with spark p