RaceFlux Basalt Fiber Spark Plug Boot Protector Sleeves for LS Engines

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Part #

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  • Keep spark plug boots safe from exhaust heat.
  • Made from basalt fiber, these sleeves have a max operating temp of 1,652°F (900°C).
  • Superior protection over common fiberglass heat sleeves.
  • Fits most straight and 90-degree boots.
  • Sold individually.
Part # HS3-25-150

RaceFlux's basalt fiber spark plug boot protector sleeves keep your spark plug wires safe from header and exhaust manifold heat. Made from basalt fabric, or "lava rock", these sleeves have a maximum continuous operating temperature of 1,652°F (900°C) and provide superior protection over typical fiberglass sleeves. They will not burn, melt, combust, or degrade even when in contact with exhaust components.

Will fit most straight and 90-degree spark plug boots. Ringless for maximum installation flexibility. Perfect for small block chevy, LS series, LT series, and other V8 engines.


  • Inside diameter: 1.0 in (25 mm)
  • Length: 6 in (150 mm).
  • Construction: Woven basalt fiber.
  • Operating temperatures:
    • -54°C (-65°F) minimum continuous.
    • 1,652°F (900°C) maximum continuous.
  • No internal metal rings for maximum flexibility.
  • Non-flammable.


  • Fits most straight and 90-degree spark plug boots.
  • Perfect for V8 engines where spark plug wires run close to the exhaust headers, such as small-block chevy engines.
Part #
Outer Layer Material
Basalt Fabric
Maximum Continuous Temperature Rating
832°F (1
Maximum Intermittent Temperature
462°F (1
Minimum Operating Temperature
-60°F (-51°C)
Inner Diameter (I.D.)
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