Running longtube headers in a tight classic GM engine bay means your spark plug wires are living close to serious heat. Speed Engineering's spark plug wire fire sleeves are the purpose-built solution — designed specifically for use with Speed Engineering 45° spark plug wires on LS and LT swap applications where header-to-wire clearance is minimal. Each sleeve is rated for continuous use up to 1200°F–1800°F and slides directly over the plug wire to shield it from exhaust heat. Sold as a set of 8, one for each cylinder.
Features:
- 8 Sleeves Per Set — One full set for a complete V8 engine
- 6" Length Per Sleeve — Sized for the exposed wire section near the headers
- 0.86" Inner Diameter — Fits Speed Engineering 45° spark plug wires
- Heat Rated for 1200°F–1800°F Continuous Use — Engineered for the high-heat environment of longtube header applications
- Designed for Use with Speed Engineering 45° Spark Plug Wires
FAQ
How many sleeves are included?
This listing includes 8 sleeves — one for each cylinder on a V8 engine.
What are the dimensions of each sleeve?
Each sleeve is 6" in length with a 0.86" inner diameter.
What spark plug wires are these sleeves designed for?
These fire sleeves are designed specifically for Speed Engineering 45° spark plug wires used in LS and LT swap applications.
What temperature rating do these sleeves carry?
Each sleeve is rated for 1200°F–1800°F continuous use — sufficient for the extreme heat environment generated by longtube headers in tight classic GM engine bays.
Why do I need plug wire fire sleeves with longtube headers?
Longtube headers on classic GM platforms run very close to spark plug wires due to tight frame clearance. Without heat protection, sustained exhaust heat can damage wire insulation and cause misfires. These sleeves provide a thermal barrier between the header tube and the wire.
