Iridium Spark Plugs 3186 & M8-48322 Wires for Chevy GMC 5.3L-6.2L

In this review the reviewer found the Iridium Spark Plugs 3186 paired with M8-48322 spark plug wires to be a practical replacement kit for owners of late 2000s to early 2010s General Motors V8 trucks and SUVs. The bottom line: this kit is for a DIY owner or mechanic who needs a full set of plug and wire replacements that match common OEM part numbers and deliver consistent electrical performance, with the biggest reason to buy being the matched plug and wire set that guarantees fit and meets OHM spec expectations.

Key Features

• Complete replacement kit: Includes eight 3186 iridium spark plugs and eight M8-48322 wires so the entire ignition circuit is serviced in one job, reducing diagnostic confusion.
• OEM cross references: Replaces a long list of factory part numbers such as 12680072 and 12621258, which helps confirm compatibility with many Chevy, GMC and Cadillac engines.
• Durable wire construction: Wires use a double silicone jacket with a fiberglass layer and heat-resistant insulation to resist cracking and heat degradation under engine bay conditions.
• Low resistance performance: Wire design and plug construction deliver the low OHM values needed for stable spark and consistent combustion.
• Wide vehicle coverage: Advertised fitment spans Silverado, Sierra, Suburban, Yukon, Avalanche, Tahoe, Corvette and others from model years roughly 2007 through 2014, simplifying parts selection for many V8 owners.

Who It's For

This kit is best for owners of Chevy Silverado and GMC Sierra trucks and their related GM V8 platforms from about 2007 to 2014 who prefer to replace all ignition components at once. It suits DIY mechanics and professional technicians who want a matched set with documented cross references to factory numbers for a confident install.

Those who should look elsewhere include owners of non-GM engines or very late-model vehicles outside the listed years, and drivers who need OEM-branded parts from a specific dealer warranty program rather than an aftermarket replacement set.

Pros & Cons

Pros

• Matches many factory part numbers, making compatibility checks straightforward and reducing returns.
• Wire quality reported as reliable with proper OHM specification, giving peace of mind about electrical performance.
• Complete eight-plug and eight-wire package removes the need to buy parts separately, saving time during service.

Cons

• Fitment is limited to the GM platforms and model years listed, so exact vehicle verification is still required.

Specifications

Our Verdict

This matched iridium plug and wire set is a sensible, cost-effective option for owners of compatible Chevy, GMC and related GM models who need a full ignition refresh. It delivers a reliable fit, documented cross references, and wires built to meet OHM and heat resistance needs, making it a practical buy for DIYers and shops looking for value without sacrificing basic performance.

Frequently Asked Questions

Will these plugs and wires fit my 2010 Silverado 1500?
They are listed as compatible with Silverado 1500 models from roughly 2007 to 2014, but always cross-check your engine code and OEM part numbers before purchase.

Do the wires meet OHM specifications?
Customers report the wires meet OHM specification and deliver consistent low resistance performance for stable spark delivery.

Are these genuine OEM parts?
This is an aftermarket replacement kit that cross references many OEM numbers but is not sold as dealer original equipment; it is intended as a direct-fit aftermarket alternative.