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10 Best Spark Plugs 2025 in the United States

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Our Top Picks

#1

Winner

ACDelco 41-962 Professional Platinum Spark Plug, (8)

The ACDelco 41-962 Professional Platinum Spark Plug offers several strong features that make it a reliable choice for car owners looking for durable spark plugs. The one-piece, fired-in suppressor seal ensures a gas-tight seal, which helps to reduce radio frequency and engine interference, regulate spark plug energy, and protect against compression pressures. This leads to a longer lifespan of the spark plug. The double platinum point pad on the center and ground electrode enhances durability and ensures consistent voltage demands, reducing wear on the ignition system.

Additionally, the pure copper core promotes cooler electrode temperatures which maximizes durability and resistance to fouling. These features contribute to a high-performance spark plug that is ideal for car users seeking longevity and reliability in their vehicle’s ignition system. However, it's important to note that this spark plug is specifically designed for cars, so it may not be suitable for other types of vehicles. The thread size is 14 millimeters, which is a common size, but users should ensure compatibility with their specific vehicle make and model.

The ACDelco 41-962 is a solid choice due to its robust construction and thoughtful design features.

#2

NGK LKAR7BIX-11S Iridium IX Spark Plug (93501 Iridium Ix), 4 Pack

The NGK LKAR7BIX-11S Iridium IX Spark Plug is an excellent choice for performance enthusiasts looking to maximize their engine's potential. Made from high-quality iridium, this spark plug is designed to offer extreme ignitability and improved throttle response. Its 0.6 millimeter laser-welded fine tip ensures high durability and a consistently stable spark, making it ideal for high-performance engines. The tapered ground electrode helps minimize the electrical quenching effect, which further enhances performance and efficiency.

Additionally, the longer insulator nose and corrugated ribs help prevent fouling and flashover, while the triple gasket seal eliminates combustion gas leakage. The trivalent metal plating provides superior anti-corrosion and anti-seizing properties, ensuring the spark plug lasts longer even under harsh conditions. However, it is specifically designed for UTVs, so it may not be suitable for all vehicle types. The thread size is M14 x 1.25, which is standard and should fit most compatible engines.

Customer reviews are highly favorable, with a 4.6 out of 5-star rating from over 2,300 ratings, indicating strong user satisfaction. This spark plug is ideal for those who require reliable performance, durability, and enhanced engine efficiency.

Customer Highlights

A summary of real customer reviews to highlight what shoppers are saying!
Material
The Iridium IX construction ensures excellent ignition efficiency and longevity, leading to smoother acceleration and enhanced engine responsiveness.
#3

8 ACD-OEM Spark Plug Wires 9748HH + 8 ACD-OEM Double Platinum Spark Plugs 41-962 + 8 Heat Shields For LS2 LS3 LS4 LS7 Engines

The 8 ACD-OEM Double Platinum Spark Plugs and Wires Set for LS2, LS3, LS4, LS7 Engines offers several strengths. The double platinum point pads on the center and ground electrodes ensure excellent durability and consistent voltage demands, which can extend the lifespan of your ignition system. Additionally, the pure copper core helps in maintaining a cooler electrode temperature, enhancing durability and reducing fouling.

The set includes heat shields, which can be beneficial in protecting the plugs and wires from engine heat, potentially prolonging their life and performance. The spark plug distributor boot shape and materials are designed for a proper fit and water-tight seal, ensuring efficient performance similar to the original GM components.

The product is highly rated with a 4.6 out of 5 stars from 691 customer reviews, indicating general satisfaction. The item is also ranked well in the automotive replacement spark plugs category, suggesting it’s a popular choice among consumers. This product is ideal for car owners looking for reliable spark plugs and wires that match OEM standards, especially for those with LS2, LS3, LS4, or LS7 engines.

Buying Guide for the Best Spark Plugs

Choosing the right spark plugs for your vehicle is crucial for maintaining engine performance, fuel efficiency, and overall reliability. Spark plugs are responsible for igniting the air-fuel mixture in the engine's combustion chamber, which powers your vehicle. When selecting spark plugs, it's important to consider several key specifications to ensure compatibility and optimal performance. Understanding these specifications will help you make an informed decision and keep your engine running smoothly.
MaterialSpark plugs are made from different materials, including copper, platinum, and iridium. The material affects the spark plug's durability and performance. Copper spark plugs are affordable and provide good performance but have a shorter lifespan. Platinum spark plugs last longer and offer better performance than copper. Iridium spark plugs are the most durable and provide the best performance, making them ideal for high-performance engines. Choose the material based on your vehicle's requirements and your driving habits.
Heat RangeThe heat range of a spark plug indicates its ability to dissipate heat from the combustion chamber. A spark plug that is too hot can cause pre-ignition and engine knocking, while one that is too cold can lead to fouling and poor performance. Heat ranges are typically indicated by a number, with lower numbers representing hotter plugs and higher numbers representing colder plugs. Consult your vehicle's manual or a professional mechanic to determine the appropriate heat range for your engine.
Gap SizeThe gap size is the distance between the center and ground electrodes of the spark plug. This gap affects the spark plug's ability to ignite the air-fuel mixture. A gap that is too small can result in weak sparks and poor combustion, while a gap that is too large can cause misfires. Most vehicles have a recommended gap size specified in the owner's manual. It's important to check and adjust the gap size to match your vehicle's specifications for optimal performance.
Thread Size and ReachThread size and reach refer to the diameter and length of the spark plug's threaded portion. These dimensions must match the engine's cylinder head to ensure proper fit and function. Using the wrong thread size or reach can cause damage to the engine or result in poor performance. Always refer to your vehicle's manual or consult a professional to ensure you select spark plugs with the correct thread size and reach for your engine.
Resistor or Non-ResistorSpark plugs can be either resistor or non-resistor types. Resistor spark plugs have an internal resistor that helps reduce electromagnetic interference (EMI) with electronic components in modern vehicles. Non-resistor spark plugs do not have this feature and are typically used in older vehicles or specific high-performance applications. If your vehicle has electronic systems that could be affected by EMI, it's best to choose resistor spark plugs.

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