7 Best Spark Plugs for 4.7 Dodge Ram (Researched and Compared)

Finding the right spark plugs for your 4.7L Dodge Ram is critical for smooth idling, fuel economy, and reliable performance. We researched manufacturer specifications, industry standards, and aggregated owner feedback from thousands of Ram owners to bring you this comparison. Our evaluation focuses on electrode material, heat range, gap retention, and real-world longevity. Whether you need a daily driver plug or something for towing, this guide covers the top options.

1. NGK 3764 Iridium IX Spark Plug: Best Overall

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The NGK 3764 Iridium IX is our top pick for the 4.7L Dodge Ram. In our evaluation of spec sheets and owner reports, this plug offers a fine iridium tip that ignites the air-fuel mixture with lower voltage, reducing misfires. The triple-gasket design ensures a secure seal, and the pre-set gap saves installation time. Owners consistently note improved throttle response and smoother idling compared to standard copper plugs.

However, the iridium construction makes it more expensive than conventional plugs. If your Ram has high mileage or you plan to replace plugs frequently, the cost may not be justified. Also, some owners report that the gap can shift if dropped during installation, so handle with care. Skip this if you need a budget-friendly option for a short-term fix.

• Fine iridium tip requires less voltage for consistent spark
• Triple-gasket sealing prevents compression leaks
• Pre-gapped to 0.044 in. for quick installation

Pros: Excellent throttle response and idle stability; Long service life typical of iridium plugs
Cons: Premium price compared to copper plugs

2. Denso 4504 Iridium TT Spark Plug: Runner Up

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The Denso 4504 Iridium TT is a strong contender for the 4.7L Ram. Based on our research, the twin-tip iridium design promotes a larger flame kernel, which can improve combustion efficiency. Many owners report it as a direct drop-in replacement with no modifications needed. The iridium construction offers longevity similar to NGK’s offering.

However, these plugs are not pre-gapped from the factory, so you must verify the gap before installation. Some users found the gap was off by 0.005 in. or more, requiring adjustment. Additionally, the price is comparable to other iridium plugs without a clear advantage in everyday driving. Skip this if you prefer a plug that is ready to install out of the box.

• Twin-tip design improves flame kernel growth
• Long-life iridium center and ground electrode
• Direct OE replacement for many Chrysler engines

Pros: OEM-grade fitment and performance; Reduced required voltage for better cold starts
Cons: Not pre-gapped; must be checked and adjusted

3. Champion 7989 Copper Plus Spark Plug: Budget Pick

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The Champion 7989 Copper Plus is the budget-friendly choice for the 4.7L Dodge Ram. In our analysis, copper plugs offer reliable performance at a fraction of the cost of precious metal plugs. They are ideal for owners who perform frequent maintenance or have older engines where premium plugs may not show a benefit. Owner feedback confirms they provide acceptable performance for daily driving.

However, copper plugs wear faster, typically needing replacement every 20,000 to 30,000 miles. They also come pre-gapped at 0.035 in., which may not match the factory specification for all model years (some require 0.040 in.). You may need to adjust the gap. Skip this if you want a long-life plug or if your Ram has modifications that demand a finer electrode.

• Lowest cost option suitable for frequent replacement
• Copper core provides good thermal conductivity
• Widely available at auto parts stores

Pros: Very affordable price point; Works well in stock engines with standard ignition
Cons: Shorter lifespan than iridium or platinum plugs; May require regapping before installation

4. Autolite APP3924 Double Platinum Spark Plug: Best Value Platinum

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The Autolite APP3924 Double Platinum plug offers a solid middle ground between price and durability. Our research shows double platinum plugs can last up to 60,000 miles, making them a cost-effective upgrade from copper. They are pre-gapped, which simplifies installation. Many Ram owners report improved fuel economy and smoother acceleration.

However, on engines with high mileage or worn ignition coils, some users experienced occasional misfires. The platinum tip may not be as robust as iridium for high-performance applications. Also, the hex size is 5/8 in., which is standard but verify your socket fits. Skip this if you have a modified engine or need maximum spark energy.

• Double platinum design extends service interval
• Platinum on both center and ground electrodes
• Pre-gapped to 0.044 in. for easy installation

Pros: Good balance of cost and longevity; Less voltage demand than standard plugs
Cons: Some owners report misfires in high-mileage engines

5. Bosch 4417 Platinum+4 Spark Plug: Unique Design

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The Bosch 4417 Platinum+4 features a distinctive four-ground electrode design. In theory, this provides multiple spark paths, which can improve combustion stability. Some owners report smoother idling in city traffic. The platinum center electrode offers decent longevity.

However, the fixed gap of 0.032 in. is tighter than the factory recommendation for many 4.7L Rams (typically 0.040-0.044 in.). This can lead to incomplete combustion and reduced power. Owner feedback is mixed; many see no benefit over standard plugs. Additionally, the design can make the plug harder to install in tight spaces. Skip this if you want a plug that matches OEM specifications exactly.

• Four ground electrodes for multiple spark paths
• Platinum center electrode resists wear
• Designed for improved idle quality

Pros: Unique design may reduce fouling in some conditions; Good for stop-and-go driving
Cons: Gap is not adjustable; fixed at 0.032 in.; Some owners report no noticeable improvement over standard plugs

6. ACDelco 41-962 Iridium Spark Plug: OEM Alternative

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The ACDelco 41-962 is an iridium plug that is commonly used in GM vehicles but also fits the 4.7L Dodge Ram. Our research indicates it offers similar performance to NGK and Denso iridium plugs at a slightly lower price. The ribbed insulator helps prevent misfires in humid conditions. Owner reports generally positive, with good throttle response and longevity.

However, the pre-set gap of 0.040 in. may be too tight for some Ram model years that require 0.044 in. Some owners had to regap them, which can be tricky with iridium tips. Also, ACDelco is not the first choice for Mopar enthusiasts, so availability may be limited. Skip this if you prefer a brand specifically engineered for Chrysler engines.

• Iridium tip for long life and consistent spark
• Ribbed insulator reduces flashover
• Pre-gapped to 0.040 in. for most applications

Pros: Good quality from a major OEM supplier; Compatible with many Mopar engines
Cons: Some Ram owners report gap needs adjustment to 0.044 in.; Not as widely recommended as NGK or Denso

7. E3 Spark Plugs E3.42 Premium Spark Plug: Performance Option

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The E3 Spark Plug E3.42 uses a patented DiamondFire electrode that creates a larger spark area. According to the manufacturer, this leads to more complete combustion. Some Ram owners report better acceleration and fuel economy, especially in trucks used for towing. The pre-gapped design is convenient.

However, the nickel alloy electrode does not last as long as iridium or platinum. Many owners found the improvement negligible compared to standard plugs. Additionally, the unique shape can make installation slightly tricky in the tight engine bay of the 4.7L Ram. Skip this if you prioritize longevity over potential performance gains.

• DiamondFire ground electrode design for better flame propagation
• Pre-gapped to 0.045 in. for most engines
• Nickel-plated shell resists corrosion

Pros: Unique design may improve fuel economy in some engines; Good for modified or high-compression engines
Cons: Mixed owner reviews; some see no improvement; Not as durable as iridium plugs

Frequently Asked Questions

What is the correct spark plug gap for a 4.7L Dodge Ram?

The factory recommended gap for most 4.7L Dodge Ram engines is 0.040 to 0.044 inches. Always check the specification for your specific model year. Using a gap that is too wide can cause misfires, while too narrow can reduce fuel economy. We recommend verifying the gap with a feeler gauge before installation.

How often should I change spark plugs on a 4.7L Ram?

Standard copper plugs should be replaced every 30,000 miles. Iridium or platinum plugs can last 60,000 to 100,000 miles. However, if you experience rough idling, reduced fuel economy, or difficulty starting, inspect the plugs sooner. The 4.7L engine is sensitive to worn plugs.

Can I use iridium spark plugs in my 4.7L Dodge Ram?

Yes, iridium plugs are compatible and often recommended for better performance and longevity. They require less voltage to fire, which reduces strain on ignition coils. Ensure the heat range matches the factory specification (typically heat range 5 for NGK).

Are double platinum spark plugs better than iridium for the 4.7L?

Double platinum plugs offer good longevity and are more affordable than iridium, but iridium typically provides a stronger spark and better performance in high-mileage engines. For daily driving, both are excellent. For towing or modified engines, iridium may be preferable.

Will aftermarket spark plugs void my Ram's warranty?

Using quality aftermarket spark plugs that meet OEM specifications should not void your warranty. However, if a plug causes damage due to incorrect heat range or gap, that repair may not be covered. Always use plugs recommended for your engine.

Our Verdict

After researching and comparing the options, the NGK 3764 Iridium IX stands out as the best spark plug for the 4.7L Dodge Ram. It offers excellent performance, durability, and easy installation. For a close runner-up, the Denso 4504 Iridium TT provides OEM-grade quality and twin-tip technology. Both are solid choices that meet the demands of this engine.