Ignition Coil Pack and Iridium Spark Plugs Set for Chevy/GMC V8

In this review of the HYR set of 8 ignition coils and iridium spark plugs, the bottom line is simple: this kit is for owners of late-model Chevy, GMC and Cadillac V8s who want a direct-fit replacement that improves combustion and addresses idle and cold-start issues. The reviewer found the set delivers stronger spark output thanks to higher coil turns and German copper windings, while the iridium plugs offer long wear life and quicker throttle response; together they are a practical, value-oriented upgrade for vehicles listed in the compatibility notes.

Key Features

• Direct Compatibility: The kit is designed to fit many 5.3L and 6.2L Chevy and GMC V8 models from 2014 to 2020, making installation straightforward for the listed vehicles.
• High Voltage Coils: Coils are wound with imported German copper and higher turns to generate 35,000+ volts, which promotes more complete combustion and can improve fuel economy.
• Iridium Spark Plugs: The included iridium center electrodes deliver fast response and long wear resistance, helping reduce cold-start hesitation and idle shake.
• OE Replacement Numbers: Designed to replace common OE coil and plug numbers such as 12573190, 12621750 and UF742, helping ensure the correct fit for vehicles on the compatibility list.
• Complete Kit: Package contains 8 ignition coils and 8 iridium spark plugs so a full-bank service can be completed at once, avoiding partial replacements.

Who It's For

This kit is aimed at DIY mechanics and professional technicians working on 2014-2020 Chevrolet and GMC V8 vehicles (Silverado, Sierra, Tahoe, Suburban, Camaro, Corvette) as well as Cadillac V8 models such as CTS and Escalade. It suits owners who want a full-bank replacement to restore ignition reliability and potentially recover lost performance or economy.

Owners of older or non-listed engines, small-block V6s, or those who require dealer-branded OEM parts for warranty reasons should look elsewhere. Also, if you need a specialized spark plug heat range or racing-specific parts, consider purpose-built alternatives.

Pros & Cons

Pros

• Direct-fit design for many 5.3L and 6.2L V8 models simplifies installation and reduces fitment guesswork.
• High-voltage coils and quality iridium plugs combine for more complete combustion and improved throttle response.
• Complete 8-coil/8-plug package delivers value for a full replacement job and avoids mixing new and old parts.

Cons

• Vehicle compatibility is specific to listed model years and engines, so confirm fitment carefully before buying.
• Power improvements received mixed feedback from customers, so gains may vary by vehicle condition and tuning.

Specifications

Brand	HYR
Contents	8 ignition coils and 8 iridium spark plugs
Compatible engines	5.3L and 6.2L V8 (selected 2014-2020 Chevy, GMC, Cadillac models)
Replaces OE numbers	12573190, 12621750, 12658183, 12674754, 12699382, 12699383, 12708496, UF742
Coil construction	Copper wire with higher coil turns, 35,000+ V output
Spark plug type	Iridium center electrode

Our Verdict

The HYR 8-coil and iridium plug set is a sensible, cost-effective choice for owners of compatible Chevy, GMC and Cadillac V8s who need a full-bank ignition replacement. It pairs high-voltage coils with durable iridium plugs to address cold-start and idle issues while offering straightforward fitment for the listed vehicles, making it good value for routine maintenance or repair.

Frequently Asked Questions

Will this kit fit my 2018 Tahoe 5.3L?
Yes, the 2018 Tahoe 5.3L is listed among compatible vehicles, but always cross-check your engine code and OE numbers before purchase.

Are the spark plugs included iridium?
Yes, the package includes iridium center electrode spark plugs designed for longer life and improved response.

Can I replace coils and plugs myself?
Yes, this is a direct-fit replacement kit intended for DIY or professional installation, but follow torque specs and safety procedures when servicing the ignition system.