ACDelco Professional spark plug wire set 9748HH — 8‑count, high‑temp silicone & reinforced fiberglass

The ACDelco Professional 9748HH is an eight-piece spark plug wire set engineered with high-temperature silicone insulators and reinforced fiberglass cores to restore reliable ignition performance.

If your engine is misfiring, running rough, or experiencing reduced fuel efficiency, worn ignition wires are a common cause. ACDelco’s Professional line delivers an aftermarket wire set designed to match factory fit and function for a wide range of domestic and import vehicles, providing consistent spark delivery and long-term durability under heat and vibration.

How does this wire set improve engine starting and throttle response?

These wires are built to maintain strong, consistent electrical conductivity from the ignition coil to each spark plug, helping ensure full combustion on every cylinder. Better spark transmission reduces hesitation during start-up and improves throttle responsiveness under load.

• Reinforced fiberglass conductors for stable signal transfer
• High-dielectric silicone insulation to resist breakdown
• Optimized length and diameter for minimal voltage loss

What materials and design features keep the wires durable in hot engine bays?

ACDelco pairs heat- and abrasion-resistant silicone with strong internal reinforcement to withstand repeated thermal cycling and engine movement. Corrosion-resistant terminals and secure coil retainers help maintain electrical reliability over time.

• High-temperature silicone insulation resists cracking and hardening
• Corrosion-resistant terminal design for long life
• Coil retainers to prevent fretting and micro-arcing

Will this set fit my vehicle and install like factory parts?

ACDelco Professional spark plug wire sets are engineered to match original equipment fit, form, and function for broad vehicle coverage across domestic makes and many imports. The boot shapes and materials are designed to seat properly on plugs and distributors, helping to create a secure, water-resistant seal.

• Engineered to OEM length and routing for straightforward installation
• Boot shapes designed for proper plug and distributor fitment
• Packaged as an 8-count set for V6/V8 and other eight-cylinder applications

How do these wires help with maintenance and service life?

By using robust insulators and protected terminals, the 9748HH set reduces the need for frequent replacement compared with older, deteriorated wires. Consistent spark delivery lowers the risk of misfires and helps maintain emissions and fuel economy between services.

• High dielectric materials reduce leakage and arcing
• Durable construction extends service intervals
• Designed for easy installation during routine tune-ups

Who is this for: The ACDelco Professional 9748HH eight-wire set is intended for DIY mechanics and professional technicians replacing worn ignition wires on compatible eight-cylinder and certain V6 engines. It’s suitable for owners of domestic and many import vehicles who want an aftermarket solution that mirrors original equipment specifications, improves ignition reliability, and resists heat and corrosion in modern engine compartments.