If you’re like me, you know that the heart of your Chevy 350 is as important as the car itself.
That’s why I’m super excited to share my journey in finding the absolute best spark plugs for this iconic engine.
Through trial and error, endless discussions with fellow gearheads, and a lot of engine tinkering, I’ve gathered some insights.
This article lists the 4 Best Spark Plug Chevy 350 engine along with my reviews on each one of them.
Top 4 Best Spark Plug Chevy 350
These are the 4 Best Spark Plug Chevy 350:
| Product Name | Buying Link | Electrode Material | Heat Range | Gap | Applications |
|---|---|---|---|---|---|
| NGK TR5IX Iridium IX Spark Plug | Check Price | Iridium | 5 | 0.6 mm | Exceptional performance and durability |
| ACDelco CR43TS Professional Conventional Spark Plug | Check Price | Copper | 5 | 0.040″ | Everyday driving, economy |
| Autolite APP605 Double Platinum | Check Price | Platinum | 6 | 0.040″ | Premium double platinum construction, copper core electrode for maximum efficiency |
| E3.42 E3 Premium Automotive Spark Plugs | Check Price | Copper | 5 | 0.040″ | Fast throttle response, improved fuel economy |
Refer to this Chevy 350 Spark Plug Wiring Diagram before looking for options to replace them.
- NGK R5IX Iridium X Spark Plug: Engineered with iridium, the most durable and conductive material for spark plugs, the NGK R5IX Iridium X stands out as a top choice for Chevy 350 engines. Its exceptional resistance to wear and corrosion ensures long-lasting performance and consistent ignition.
- NGK K-3403 Iridium IX Power Platinum Spark Plug: This spark plug offers a balance of quality and affordability, making it an excellent option for those seeking a reliable and cost-effective solution. Its fine wire center optimizes ignition, while its platinum construction ensures durability and consistent performance.
- Autolite APP605 Double Platinum Spark Plug: Designed to deliver optimal engine performance, the Autolite APP605 Double Platinum Spark Plug features premium double platinum construction and a copper core electrode for maximum efficiency. It’s an ideal choice for those seeking enhanced performance and fuel economy.
- Excel 0526 Copper Core Spark Plug: For those prioritizing fast throttle response and improved fuel economy, the Excel 0526 Copper Core Spark Plug is a compelling option. Its copper core construction and machine-rolled threads provide exceptional conductivity and protection for your engine head.
If you have the HEI ignition system, refer to this Chevy 350 HEI Spark Plug Wiring Diagram instead.
Best Spark Plug Chevy 350 Reviews
These are the reviews of the above-mentioned Best Spark Plug Chevy 350:
1. NGK TR5IX Iridium IX Spark Plug
- Electrode Material: Iridium
- Heat Range: 5
- Gap: 0.6 mm
- Applications: Exceptional performance and durability
- Review: The NGK TR5IX Iridium IX Spark Plug is a game changer for those who prioritize performance. The iridium electrode ensures longevity and consistent firing, making it a top choice for enthusiasts who demand the best. Its 0.6 mm gap delivers precise ignition, enhancing the overall efficiency of your Chevy 350. This spark plug is an investment in your engine’s future, providing reliable performance under demanding conditions.
2. ACDelco CR43TS Professional Conventional Spark Plug
- Electrode Material: Copper
- Heat Range: 5
- Gap: 0.040″
- Applications: Everyday driving, economy
- Review: The ACDelco CR43TS is the go-to spark plug for daily drivers. Its copper core offers good conductivity and the heat range is ideal for a standard Chevy 350 setup. If you’re looking for a cost-effective, reliable solution for everyday use, this is your pick. It doesn’t boast the high-tech features of some of its rivals, but for routine driving, it delivers solid performance and value.
3. Autolite APP605 Double Platinum Spark Plug
- Electrode Material: Platinum
- Heat Range: 6
- Gap: 0.040″
- Applications: Premium double platinum construction, copper core electrode for maximum efficiency
- Review: Autolite APP605 steps up the game with its double platinum construction, offering superior longevity and consistent performance. The slightly higher heat range makes it a great fit for Chevy 350 engines that run a bit hotter, perhaps due to performance modifications. Its focus on efficiency makes it a worthy upgrade for those looking for a balance between performance and durability.
4. E3.42 E3 Premium Automotive Spark Plugs
- Electrode Material: Copper
- Heat Range: 5
- Gap: 0.040″
- Applications: Fast throttle response, improved fuel economy
- Review: E3.42 spark plugs are a fantastic choice for drivers seeking a noticeable improvement in throttle response and fuel economy. The unique electrode design promotes efficient combustion, making your Chevy 350 more responsive and enjoyable to drive. While they might not be as long-lasting as iridium or platinum options, they offer a noticeable upgrade in engine performance, especially in terms of acceleration and fuel efficiency.
If you also want to upgrade the camshaft while you are at it, check out the best street cam for small block Chevy.
Factors to Consider When Choosing Spark Plugs for Your SBC 350 Engine
These are the top 4 factors to Consider When Choosing Spark Plugs for Your SBC 350 engine:
- Engine Type and Performance Requirements: Consider the specific engine type and performance demands of your Chevy 350. Consult your vehicle’s owner’s manual or consult with a qualified mechanic to determine the recommended spark plug specifications.
- Spark Plug Heat Range: The heat range indicates the spark plug’s ability to dissipate heat. A hotter spark plug is suitable for high-performance engines, while a colder spark plug is better suited for everyday driving conditions.
- Electrode Material: The electrode material plays a crucial role in spark plug performance and longevity. Iridium and platinum offer superior durability and resistance to wear, while copper provides enhanced conductivity.
- Spark Plug Gap: The spark plug gap is the distance between the center electrode and the ground electrode. Proper gap setting ensures optimal spark intensity and engine performance.
How does the gap size in a spark plug affect SBC 350 engine performance?
The gap size in a spark plug affects the spark’s ability to ignite the air-fuel mixture in the SBC 350 engine. A properly sized gap ensures efficient combustion, which can improve engine performance and fuel economy. However, an incorrect gap can lead to misfires and reduced engine efficiency.
You might want to take a look at the Chevy 350 engine diagram if there is any confusion in the wiring.
Why choose a platinum spark plug like Autolite APP605 for a Chevy 350?
Platinum spark plugs, such as Autolite APP605, offer a balance between performance and durability. They are more resistant to wear compared to copper plugs and are well-suited for engines that run hotter or have minor performance enhancements.
Can using the right spark plug improve fuel economy in a Chevy 350?
Yes, using the right spark plug can lead to more efficient combustion, which in turn can improve fuel economy. Spark plugs like E3.42 are designed to enhance fuel efficiency by ensuring fast and complete combustion.
How often should spark plugs be changed in a Chevy 350?
The frequency of changing spark plugs depends on the type of spark plug, but copper spark plugs should be checked and possibly replaced every 30,000 miles, while iridium and platinum plugs can last up to 60,000 to 100,000 miles.
FAQs on Best Spark Plug Chevy 350
These are the most frequently asked questions on the Best Spark Plug Chevy 350:
What makes iridium spark plugs a good choice for a Chevy 350?
Iridium spark plugs offer superior longevity and consistent performance due to their high melting point and resistance to electrical erosion. They are ideal for those seeking reliability and efficiency in high-performance applications.
Are copper spark plugs like ACDelco CR43TS suitable for daily driving?
Yes, copper spark plugs like ACDelco CR43TS are great for everyday driving. They provide good conductivity and are cost-effective, making them suitable for standard driving conditions and engines without significant modifications.
Conclusion
Choosing the best spark plug for Chevy 350 is essential for maintaining optimal engine performance, fuel efficiency, and longevity. By considering the factors mentioned above and following the recommended maintenance guidelines, you can ensure your Chevy 350 continues to run smoothly and efficiently for years to come.
