Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
⚠️ California Proposition 65 Warning : Some products sold on this website may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
For more information, visit www.P65Warnings.ca.gov.
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 are the dimensions of the E3.66 spark plug?A: The E3.66 spark plug measures six point five five inches in length, one point seven inches in width, and one point four six inches in height.
Q: What is the thread diameter of the E3.66 spark plug?A: The thread diameter of the E3.66 spark plug is fourteen millimeters, making it compatible with many automotive applications.
Q: What is the reach of the E3.66 spark plug?A: The E3.66 spark plug has a reach of one inch, designed to fit a variety of engine types.
Q: How do I install the E3.66 spark plug?A: To install the E3.66 spark plug, ensure the engine is cool, remove the old plug, and screw in the new one, tightening it securely.
Q: Is the E3.66 spark plug suitable for Hemi engines?A: Yes, the E3.66 spark plug is designed to fit a wide variety of late model applications, including Hemi engines.
Q: Can I use the E3.66 spark plug in my truck?A: Yes, the E3.66 spark plug is primarily used in a variety of automotive and truck applications, ensuring good performance.
Q: How do I maintain the E3.66 spark plug?A: To maintain the E3.66 spark plug, regularly check for wear and replace it every one hundred thousand miles or five years for optimal performance.
Q: Is the E3.66 spark plug covered by a warranty?A: Yes, the E3.66 spark plug includes a limited lifetime warranty, providing assurance of its quality.
Q: How do I know when to replace my E3.66 spark plug?A: You should replace your E3.66 spark plug if you notice engine misfires, reduced performance, or after one hundred thousand miles.
Q: What makes the DiamondFIRE technology unique in the E3.66 spark plug?A: The DiamondFIRE technology provides an edge-to-edge spark path, increasing power and efficiency while reducing emissions.
Q: Is the E3.66 spark plug environmentally friendly?A: Yes, the E3.66 spark plug is designed to improve hydrocarbon emissions, making it a more environmentally friendly option.
Q: What kind of materials are used in the E3.66 spark plug?A: The E3.66 spark plug features a Yttrium-enhanced alloy for durability and a patented DiamondFIRE electrode for optimal performance.
Q: Does the E3.66 spark plug fit older models?A: The E3.66 spark plug is primarily designed for late model applications and may not be suitable for older engine models.
Q: Can the E3.66 spark plug improve fuel efficiency?A: Yes, the E3.66 spark plug is designed to reduce fuel consumption while enhancing overall engine efficiency.
Q: What should I do if my E3.66 spark plug arrives damaged?A: If your E3.66 spark plug arrives damaged, contact customer service for a return and replacement under the warranty.