Almost anyone with headers on their car or truck has experienced burned spark plug wires and has melted through a spark plug boot or two. This article will help you pick the best spark plug wire heat shield sleeves, guiding you through the maze of options so that you can make a choice that is both cost-effective and just plain effective at saving your spark plug wires from heat damage.
Let’s look at the types of potential damage and the associated costs from when hot exhaust and spark plug wires share close quarters. Obviously, you have the cost of replacing said wires, which in race applications could mean an expense of more than $100. Not so obvious, though, is that when a spark plug boot melts, it could create an ignition misfire/no-fire problem. That could cause you to lose a race or end up stuck on the side of the road, and it could potentially cause engine detonation due to a buildup of unburnt fuel in various cylinders and intake runners.