10.5 mm performance racing spark plug wires Universal set for engines Ready for install straight out of the packaging Electronic ignition HEI plug wires with 90 degree boots on both ends Delivers spark to your plugs with a set of performance ignition wires Key benefits Clear compatibility: universal for engines that require 10.5 mm plug wires and HEI electronic ignition systems Easy installation: ready to install straight out of the package Flexible fit: 90 degree boots on both ends for tight engine bays and multiple routing options performance ignition: designed to deliver reliable spark to plugs with a dedicated performance wire set Specifications and features to note Wire diameter: 10.5 mm Type: performance racing spark plug wires Ignition compatibility: HEI electronic ignition systems Boot angle: 90 degrees on both ends Use scenarios Replacing worn plug wires on a vehicle with an electronic ignition HEI system to restore reliable ignition performance Installing in a performance or race engine where tight clearance requires 90 degree boots on both ends Using as a universal replacement wire set for engines that require 10.5 mm performance ignition wires for improved ignition reliability Practical considerations Suitable for universal engine applications needing 10.5 mm wires Provides a straightforward upgrade path for performance ignition setups Provides a direct fit for compatible HEI systems with the included 90 degree boots