Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
Welcome Offer : Use Code WELCOME5 for 5% OFF your first order!
Free Shipping Across USA
The E3.66 auto spark plug is a 14mm, 1.000” reach plug with a taper seat. It fits a wide variety of late model applications, especially Hemi applications. E3.66 is widely stocked in automotive retail stores. E3 automotive plugs have three legs securing the DiamondFIRE electrode to the shell. This allows for excellent heat transfer, and helps to create more turbulence in the cylinder. The patented DiamondFIRE side wire is proven to increase power, reduce fuel consumption and improve hydrocarbon emissions in long-term use. The unique ground electrode and full-size center electrode also provides optimal performance for a guaranteed five years or 100,000 miles. Part Number: E3.66; Resistor: Resistor; Hex Size: 5/8; Thread Reach: 1.000; Thread Diameter: 14mm; Seat: Taper; Tip/Gap: DiamondFIRE Fixed Gap Cannot Be Adjusted. Our unique DiamondFIRE open design forces air gap discharges, creating the preferred edge-to-edge spark path. The design allows replenishment of the spark zone with a fresh fuel/air charge, and exposes the flame front more directly to the piston head than other plug designs. This distinctive spark plug design has proven to simultaneously increase engine power output, reduce gasoline consumption, decrease hydrocarbon and carbon monoxide emissions from the engine, and materially extend the life of the spark plug. Our lawn and garden spark plugs help engines operate more efficiently with a faster and smoother acceleration.
Yes, we offer free standard shipping on all orders within the United States.
When will I receive my item?
Domestic orders typically arrive within 3-5 business days. Delivery times are estimated and may vary depending on your location, weather conditions, or other unforeseen factors.
Can I change or return my item?
We hope you love your purchase, but if you need to make a change or return your item, we’ve got you covered! You can initiate a return or exchange within 30 days of receiving your order. Please ensure the product is in its original condition and packaging. For more information on our return policy, please visit our Returns & Exchanges page.
Frequently Asked Questions
Q: What vehicles are compatible with the E3.66 spark plug?A: The E3.66 spark plug is designed to fit a wide variety of late model applications, particularly domestic vehicles, and is widely used in Hemi applications. It is suitable for a range of automotive and truck applications, making it versatile for many car owners.
Q: How does the DiamondFIRE technology improve engine performance?A: The patented DiamondFIRE technology enhances engine performance by creating a more efficient spark with an edge-to-edge design that ensures maximum combustion. This results in increased power, reduced fuel consumption, and lower hydrocarbon emissions, providing a cleaner and more efficient engine operation.
Q: What is the lifespan of the E3.66 spark plug?A: The E3.66 spark plug is built for durability and performance, guaranteed to last for five years or up to 100,000 miles under normal driving conditions, making it a reliable choice for long-term use.
Q: Can I use the E3.66 spark plug for performance modifications?A: Yes, the E3.66 spark plug is designed with colder heat ranges to support performance modifications. Its Yttrium-enhanced alloy helps reduce side wire temperature, which minimizes the risk of pre-ignition during enhanced engine performance scenarios.
Q: How should I care for my E3.66 spark plug to ensure optimal performance?A: To maintain optimal performance of your E3.66 spark plug, ensure proper installation with the correct torque specifications. Regularly check for signs of wear or damage, and replace the spark plug according to your vehicle's maintenance schedule to keep your engine running efficiently.
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