Shrink Sleeve - Numbered for Cylinders

The shrink sleeve numbered for cylinders (MSD3415) is an essential organizational tool for engine builders, mechanics, and enthusiasts performing ignition system work. This set of eight cylinder markers simplifies spark plug wire identification during installation, troubleshooting, and maintenance—eliminating guesswork and preventing costly firing order mistakes. Whether you're rebuilding a classic V8, diagnosing a misfiring modern engine, or swapping an ignition harness, these numbered shrink sleeves keep your wire routing organized and traceable.

Each heat-shrink sleeve is color-coded and numbered to correspond with individual cylinders, sliding directly onto spark plug wires for permanent, tamper-proof identification. The shrink material bonds firmly under heat application, resisting oil, fuel, and engine vibration without peeling or fading—critical for long-term reliability in high-heat engine compartments. Lightweight yet durable, the complete set weighs just 0.11 pounds and fits compactly in any toolbox, making these markers an affordable alternative to complete rewiring when you need to verify or restore proper wire sequence.

Benefit most from this product if you're reassembling an engine after head work, diagnosing intermittent ignition faults, or converting between carbureted and fuel-injected ignition systems. Installation takes seconds—simply slide the numbered sleeve onto each wire and apply heat with a heat gun or lighter until fully shrunk. Compatible with all standard 7–8mm spark plug wire diameters across domestic and import engines, these cylinder markers are indispensable for any technician who values precision and repeatability in engine performance work.