Radiant heat from long-tube headers, exhaust manifolds, and turbo housings bakes spark plug boots from the outside in, causing wire degradation, arcing, and misfires that rob power and reliability. Heatshield Products Lava Boot Shields wrap each plug boot in dual-layer, natural basalt fiber sleeving rated to 1,200°F continuous and 2,000°F intermittent, cutting off that heat path before it reaches the boot or wire.
Serious thermal protection without serious effort. The flexible, soft, expandable sleeving slides over the plug boot by hand with no tools required. A metal retention ring locks the sleeve in place so it cannot migrate up the wire and expose the boot to heat. The no-fray cuff keeps the sleeve clean and intact through repeated removal and reinstallation.
Built for the tightest engine bays. The flexible construction bends easily around angled plug designs and tight header clearances common on LS swaps, boosted builds, classic muscle, marine engines, and off-road rigs. The sleeve fits most standard plug boot sizes and angles without modification, making it a direct solution for any cylinder running close to a heat source.
Wall thickness that backs the rating. Insulation wall thickness exceeds 0.050 inches, giving the dual-layer material enough mass to block radiant heat rather than just slow it. That consistent thermal barrier helps eliminate heat-soak misfires, reduces arcing risk, and keeps ignition output stable across all cylinders during sustained high-heat operation.
Product Benefits
- 1,200°F Continuous Rating: Dual-layer basalt fiber sleeving handles sustained extreme engine and exhaust heat.
- 2,000°F Intermittent Rating: Handles brief heat spikes common near headers and turbos.
- Metal Retention Ring: Locks the sleeve at the boot so it cannot slide up the wire and expose the plug.
- No-Tools Installation: Flexible, expandable material slides on by hand in seconds.
- Wide Fitment: Compatible with most plug boot sizes, angles, and ignition configurations including LS systems.
- 0.050-Inch-Plus Wall Thickness: Substantial insulation mass for real heat blocking, not just surface coverage.
- Available in 2-Pack or 8-Pack: Spot-treat a single problem cylinder or cover a full V8 in one purchase.
- Made in the USA: Manufactured domestically with premium heat-resistant materials.
About Heatshield Products: Heatshield Products is the originator of the spark plug boot protector category, developing the first boot shield and continuing to engineer heat management solutions for automotive, marine, and off-road applications. Every product is made in the USA and built around measurable thermal performance standards.
WARNING: California Residents: Cancer and Reproductive Harm;
www.p65warnings.ca.gov
