Skip to product information
SKU:
NLT1I00277
Ships for free in 2–4 business days.
8-Pack Black 6-Inch Spark Plug Boot Heat Shield Sleeves
$22.99
In Stock
$22.99
Sale price
$22.99
Regular price
This eight-piece set of black 6-inch spark plug boot sleeves is designed to reduce radiant heat exposure near headers and exhaust manifolds.
Estimated delivery between
Let Northline Parts Do the Heavy Lifting for You!
Not sure which part you need? Our team can help you find the right replacement.
Parts Support Hours: Monday–Friday, 8:00 AM–5:00 PM CT
Live Chat: Available 24/7
I reached out for some replacement head bolts and they responded quickly with a few questions and cautionary information and is sending me some bolts. Great customer service! Thanks
Edward H. — Verified customer
Compatible Models
We do our best to list all compatible models. Although this may be the part you need, your exact model may not appear below.
Compatible equipment / model
- Universal V8 spark-plug wire applications
- GM LS-series engine builds
- Small-block and big-block Chevrolet applications
- Ford and Mopar engines with exposed plug wires
- Hot rods, race cars, trucks, and custom header installations
Product Overview
Melted boots and hardened plug wires can cause misfires that appear only after the exhaust gets hot. These flexible sleeves create an extra thermal barrier around straight, 45-degree, or 90-degree boots where clearance is tight. The advertised 2500-degree figure refers to intermittent material exposure, not safe continuous contact with a glowing header.
That distinction matters for buyers looking for the correct service part, not simply another similarly named item. Confirm approximately 6-inch length, boot/wire diameter, available clearance, and that the sleeve can be kept off sharp or moving parts.
Key Features & Performance
- Eight individual thermal-protection sleeves
- Approximately 6 inches long
- Flexible fit over common straight and angled boots
- Black finish blends into engine bays
- Double-layer heat-resistant fiber construction
Common Uses
- Protecting plug wires routed near headers
- Stopping repeat heat damage on one bank of cylinders
- Adding protection after an engine or header swap
- Reducing heat-related ignition misfire risk
Technical Specifications
- Product Type: Spark Plug Boot Heat Sleeve Set
- Quantity: 8
- Length: Approximately 6 Inches
- Color: Black
- Application: Universal
- Advertised Intermittent Temperature: Up to 2500°F under specified conditions
Installation & Fitment
- Install only on a cool engine
- Inspect and replace already-burned boots or wires
- Slide each sleeve fully over the vulnerable boot area
- Maintain air gap from headers whenever possible
- Secure wiring so sleeves cannot contact belts, fans, or sharp edges
Compatibility Notice
Northline Parts does its best to list all known compatible models, but the correct part may fit an application not shown. Confirm approximately 6-inch length, boot/wire diameter, available clearance, and that the sleeve can be kept off sharp or moving parts.
Frequently Asked Questions
Q: Can the sleeves rest directly on the header? A: Avoid direct contact; radiant protection is different from continuous surface contact.
Q: Will they fix an existing misfire? A: They prevent further heat exposure but cannot repair a carbon-tracked boot, damaged wire, plug, or coil.
Q: Do they fit angled boots? A: The flexible design fits many straight and angled boots, but measure diameter and clearance.
Part Summary
keywords: spark plug boot heat shield sleeves, 6 inch black plug wire protectors, header heat misfire protection, 8 pack ignition wire insulation, 2500 degree intermittent boot cover
Brand names, model numbers, and reference part numbers are used for identification and compatibility purposes only. Verify the original component, dimensions, and application before purchase.