Spark Plug Boot Shrink Sleeve Kit (18)

The Spark Plug Boot Shrink Sleeve Kit (18) by MSD Ignition is an essential maintenance and protection solution for any ignition system upgrade or restoration project. Whether you're running a high-performance engine, vintage muscle car, or daily driver with an aftermarket ignition system, spark plug boots are vulnerable to heat, moisture, and arcing—all of which degrade electrical connections and cause misfires. This 18-piece kit provides a cost-effective way to insulate and protect your spark plug connections from environmental damage and electromagnetic interference that can compromise spark delivery and engine performance.

MSD's shrink sleeve design uses heat-activated polyolefin material that conforms tightly around spark plug boots and wire connections, creating a durable moisture and dielectric barrier. The shrink-to-fit technology eliminates gaps where water, oil vapor, and contaminants can accumulate and cause voltage leakage or tracking—a common cause of rough idle and stumble on high-performance or carbureted engines. Unlike rigid boots, these sleeves flex with engine vibration and thermal expansion, reducing stress on delicate connections while maintaining consistent electrical integrity even under extreme underhood temperatures. The compact kit measures 6.05 x 1.5 x 7.85 inches and weighs just 0.18 lbs, making it ideal for carrying in your toolbox for roadside repairs or track events.

Mechanics and enthusiasts benefit most from this kit when upgrading to MSD ignition coils, spark plug wires, or custom harnesses where OEM boot protection is inadequate or missing. The 18-pack provides enough sleeves for a full V8 ignition system with spares for future maintenance or replacement. Installation is straightforward—simply slide the sleeve over the boot connection, apply heat with a heat gun or lighter, and allow it to shrink firmly into place. Compatible with most aftermarket and stock spark plug boots, this kit is particularly valuable for vintage builds, turbocharged applications, and any high-vibration environment where electrical connections face elevated stress and moisture exposure.