A-Premium HEI Spark Plug Wires Set of 9 for Chevrolet V8 — 10.5mm Blue Silicone, 90° Boots

The A-Premium 10.5MM Electronic Ignition HEI spark plug wire set is a nine-piece, silicone-jacketed wiring kit designed to deliver reliable ignition performance for many Chevrolet small- and big-block V8 engines.

This complete set of nine blue spark plug wires is built with 10.5mm diameter cores, silicone insulation, and 90-degree boots on both ends to provide improved dielectric strength, heat resistance, and a neater engine-bay routing. The kit includes a range of lengths to match the different cylinder positions on common Chevy V8s, and A-Premium backs the product with a one-year unlimited-mileage warranty for added confidence.

Which Chevrolet engines will these wires fit?

These wires are supplied as a universal replacement kit intended for many Chevrolet small-block and big-block V8 engines. They cover a broad set of displacements and factory families when used with compatible HEI distributors and terminals.

• Compatible with SBC 302, 305, 307, 327, 350, 400 series engines
• Works with BBC 348, 366, 396, 402, 409, 427, 454, 496, 502, 572, 632
• Covers displacements from roughly 4.9L up to 10.4L for V8 applications
• Intended for vehicles using HEI-style distributors and standard spark plug/coil terminals

What are the wire specifications and included lengths?

Each cable in this nine-piece kit features a 10.5mm diameter core with silicone insulation and silicone outer jacket for improved heat and ozone resistance. The wires arrive pre-cut in specific lengths to simplify installation and ensure proper routing without stretching or excess slack.

• Wire diameter: 10.5 mm for solid dielectric and suppression properties
• Insulation & jacket: high-temp silicone for durability in hot engine bays
• Boots: 90-degree on both ends to ease tight-angle connections
• Included lengths: 45.9", 41.5", 38.6", 36.6", 3×32.7", 29.1", 20.7"

How do these wires affect installation and engine appearance?

The silicone jacket and color-coordinated blue finish help keep the engine bay tidy while resisting oil and heat. Ninety-degree boots make connections easier in confined spaces and help prevent kinking at attachment points.

• Color: vibrant blue jacket improves visual organization under the hood
• Boot angle: 90° boots reduce stress at terminals and simplify tight installs
• Pre-sized lengths: minimize trimming or juggling during routing
• Durability: silicone resists cracking, keeping connections sealed longer

What warranty and part references come with the set?

A-Premium supports this ignition wire kit with a one-year unlimited-mileage guarantee, which covers workmanship and materials under normal use. The product also lists common reference numbers to help confirm fitment when cross-referencing parts catalogs.

• One-year unlimited-mileage guarantee for manufacturing defects
• Reference numbers: SP10-390-1010, SBC350, SP103901010 for compatibility checks
• Pack quantity: 9 pieces — full set for most V8 HEI ignition systems

Who is this for: This A-Premium nine-piece 10.5mm HEI spark plug wire set is aimed at classic Chevy V8 owners, restoration shops, and performance hobbyists who need a complete, durable wiring kit for small-block and big-block engines. Choose this set if you want silicone-insulated cables with 90-degree boots, pre-cut lengths for straightforward installation, and a clear warranty to back the purchase.