If you’re looking for the best spark plugs for a Trailblazer SS, the goal is usually simple: strong ignition, smooth idle, reliable cold starts, and long service life for the LS2 V8. The right plug depends on whether your SUV is stock, mildly modified, or boosted, but the options below are all proven, real-world choices that fit the Trailblazer SS platform well.
1. ACDelco Professional Iridium Spark Plug 41-162
A dependable OEM-style iridium plug that’s one of the safest all-around choices for a stock or lightly modified Trailblazer SS.
- OE-quality iridium center electrode
- Designed for long service intervals
- Excellent cold-start and idle performance
- Strong fit for stock LS2 applications
Pros: Factory-like drivability, long life, easy to trust on a daily driver.
Cons: Not the most performance-focused option for aggressive tuning.
Approx. price range: $8–$15 per plug
2. NGK Iridium IX Spark Plug TR55IX
A popular performance upgrade for LS engines, offering crisp ignition and strong durability for street-driven Trailblazer SS builds.
- Fine-wire iridium center electrode
- Quick, consistent spark response
- Good choice for mild bolt-ons
- Resists fouling well under normal use
Pros: Great reputation, smooth running, widely used in GM V8 applications.
Cons: Not ideal if your setup needs a colder heat range.
Approx. price range: $8–$14 per plug
3. NGK Iridium IX Spark Plug TR6IX
A colder iridium option often chosen for Trailblazer SS trucks with more aggressive tuning, headers, or added power.
- Colder heat range than TR55IX
- Fine-wire iridium tip for efficient ignition
- Helpful for higher-cylinder-pressure setups
- Good anti-fouling characteristics
Pros: Better suited to modified engines, strong performance under load.
Cons: Can be too cold for a completely stock daily driver.
Approx. price range: $8–$14 per plug
4. ACDelco Professional Iridium Spark Plug 41-110
Another OE-style ACDelco iridium plug that works well for drivers who want a factory-like feel and reliable long-term performance.
- Iridium center electrode for longevity
- Stable spark delivery for daily use
- Designed for GM V8 compatibility
- Good choice for maintenance refreshes
Pros: Smooth operation, OEM-level confidence, solid durability.
Cons: Less performance-oriented than some aftermarket choices.
Approx. price range: $8–$16 per plug
5. NGK Laser Iridium Spark Plug 6619
A premium iridium plug that offers excellent ignition quality and long service life for Trailblazer SS owners who want a top-tier street option.
- Laser-welded iridium center electrode
- Excellent durability and consistency
- Strong cold-start performance
- Well suited to long maintenance intervals
Pros: Premium construction, smooth idle, excellent longevity.
Cons: Usually costs more than standard iridium plugs.
Approx. price range: $12–$20 per plug
6. Denso Iridium Power Spark Plug IKH22
A performance-oriented iridium plug known for strong ignition and efficient combustion in modified street vehicles.
- 0.4 mm iridium center electrode
- Fast flame kernel development
- Good for spirited street driving
- Compact design for efficient spark delivery
Pros: Sharp throttle response, high-quality construction, performance-friendly.
Cons: May not be the first pick for those wanting OEM-style plug behavior.
Approx. price range: $8–$15 per plug
7. Bosch Platinum+4 Spark Plug 4458
A long-standing multi-ground-electrode plug that can work in some Trailblazer SS applications, especially for drivers prioritizing longevity over performance tuning.
- Four ground electrodes
- Platinum center electrode
- Designed for extended wear resistance
- Stable spark path under normal driving
Pros: Durable, easy to find, decent service life.
Cons: Not the best choice for performance builds or heavily modified LS engines.
Approx. price range: $6–$12 per plug
8. E3 Spark Plugs E3.68
An alternative spark plug design aimed at improving combustion efficiency, often considered by owners who want something different from conventional plugs.
- DiamondFIRE ground electrode design
- Intended to improve flame propagation
- Corrosion-resistant construction
- Suitable for street use
Pros: Unique design, commonly marketed for efficiency gains, easy to source.
Cons: Results can vary versus proven OEM-style iridium plugs.
Approx. price range: $7–$13 per plug
9. Autolite XP Iridium Spark Plug XP5263
A budget-friendly iridium plug that can be a practical replacement choice for Trailblazer SS owners wanting solid everyday performance without premium pricing.
- Fine-wire iridium center electrode
- Designed for improved ignitability
- Good wear resistance for the price
- Suitable for routine maintenance
Pros: Good value, easy upgrade from worn stock plugs, widely available.
Cons: Less proven in LS performance circles than NGK or ACDelco.
Approx. price range: $5–$10 per plug
10. Champion Iridium Spark Plug 9407
A straightforward iridium replacement option for drivers who want a reputable brand and dependable daily performance.
- Iridium center electrode for longer life
- Consistent spark for stock engines
- Built for standard maintenance intervals
- Good fit for general street use
Pros: Affordable, dependable, easy maintenance replacement.
Cons: Usually not the first pick for high-power LS builds.
Approx. price range: $6–$11 per plug
Buying tip: For most Trailblazer SS owners, the best spark plugs are usually OEM-style iridium plugs in the correct heat range, with NGK and ACDelco leading the pack. If your truck is tuned, cammed, or making more heat, stepping to a colder plug like the NGK TR6IX is often the smarter move.