--- product_id: 1247625 title: "Spark Plugs E3.66 Premium Automotive Spark Plug with DiamondFIRE Technology for Hemi Engines, 14mm, 1.000\" Reach, Gasket Seat, Pack of 1" brand: "e3" price: "$24.22" currency: USD in_stock: true category: "E3" url: https://www.desertcart.ec/products/1247625-spark-plugs-e3-66-premium-automotive-spark-plug-with-diamondfire store_origin: EC region: Ecuador --- # DiamondFIRE tech for faster combustion 14mm thread & 1.000" reach for perfect fit 5-year/100,000-mile durability warranty Spark Plugs E3.66 Premium Automotive Spark Plug with DiamondFIRE Technology for Hemi Engines, 14mm, 1.000" Reach, Gasket Seat, Pack of 1 **Brand:** e3 **Price:** $24.22 **Availability:** ✅ In Stock ## Summary > ⚡ Spark your engine’s evolution with DiamondFIRE brilliance! ## Quick Answers - **What is this?** Spark Plugs E3.66 Premium Automotive Spark Plug with DiamondFIRE Technology for Hemi Engines, 14mm, 1.000" Reach, Gasket Seat, Pack of 1 by e3 - **How much does it cost?** $24.22 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.ec](https://www.desertcart.ec/products/1247625-spark-plugs-e3-66-premium-automotive-spark-plug-with-diamondfire) ## Best For - e3 enthusiasts ## Why This Product - Trusted e3 brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Eco-Friendly Efficiency:** Reduces hydrocarbon emissions and carbon buildup, helping your ride stay green and compliant. - • **Ignite Peak Performance:** Patented DiamondFIRE side-wire electrode delivers faster, cleaner combustion for max power output. - • **Built to Last, Guaranteed:** Backed by a 5-year or 100,000-mile warranty, engineered for long-term reliability and consistent performance. - • **Cooler Running, Smoother Drive:** Yttrium-enhanced alloy and colder heat range prevent pre-ignition and support high-performance tuning. - • **Precision Fit for Hemi Engines:** 14mm thread diameter with 1.000" reach and gasket seat ensures seamless installation and optimal engine compatibility. ## Overview The E3.66 Premium Spark Plug features patented DiamondFIRE technology with a unique side-wire electrode design that enhances combustion efficiency, power, and fuel economy. Designed specifically for Hemi and other domestic engines, it offers a precise 14mm thread and 1.000" reach with a gasket seat for perfect fitment. Engineered with a colder heat range and yttrium alloy for durability and performance, it reduces emissions and carbon buildup. Backed by a 5-year/100,000-mile warranty, this spark plug ensures long-lasting, reliable ignition for a cleaner, more powerful drive. ## Description Product Description The E3.66 automotive spark plug is a high-performance solution designed to fit a wide range of late-model applications, particularly Hemi engines. With a 14mm thread diameter and 1.000-inch reach, this spark plug features a gasket seat and is widely available in automotive retail stores. E3’s patented DiamondFIRE side wire is securely fastened to the shell using a three-leg design, which allows for excellent heat transfer and creates more turbulence in the combustion chamber. This innovative design results in a more complete fuel burn, leading to increased power, better fuel efficiency, and reduced hydrocarbon emissions during long-term use. Includes a unique ground electrode and full-size center electrode, offering optimal performance for up to five years or 100,000 miles. The DiamondFIRE open design creates the preferred edge-to-edge spark path, replenishing the spark zone with fresh fuel/air charge and directly exposing the flame front to the piston head, resulting in improved engine power, reduced fuel consumption, and decreased carbon monoxide emissions. This spark plug design has been proven to extend the life of the spark plug while offering faster, smoother acceleration for a more efficient engine operation. desertcart.com ## Features - FOR DOMESTIC APPLICATIONS: Designed to fit a wide range of domestic vehicles, this spark plug enhances power, improves fuel economy, and reduces harmful hydrocarbon emissions, making it ideal for various engine types and models - DIAMONDFIRE TECHNOLOGY: Patented side-wire electrode design ensures faster, more complete combustion, optimizing engine efficiency, improving power output, and reducing harmful emissions - LOWER EMISSIONS: The more complete burn helps to reduce emissions, minimize carbon buildup, promote cleaner combustion, and support compliance with modern environmental and emissions standards - ENGINEERED FOR PERFORMANCE: Colder heat range and Yttrium-enhanced alloy help reduce side-wire temperatures, prevent pre-ignition, and support performance modifications across a variety of engine types - 5-YEAR WARRANTY: Built for long-lasting performance and reliability across various vehicles and imports; includes a 5-year or 100,000-mile limited warranty for added peace of mind ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0018JV5PG | | Automotive Fit Type | Vehicle Specific Fit | | Best Sellers Rank | #1,254,086 in Automotive ( See Top 100 in Automotive ) #6,366 in Automotive Replacement Spark Plugs | | Brand Name | E3 | | Compatible with Vehicle Type | Car | | Core Material | Copper | | Customer Reviews | 4.4 4.4 out of 5 stars (547) | | Gap Size | 0.04 inches | | Global Trade Identification Number | 00894489000664 | | Included Components | (1) Spark Plug | | Item Type Name | Spark Plugs | | Item Weight | 3.2 ounces | | Manufacturer | E3 Spark Plugs | | Manufacturer Part Number | E3.66 | | Manufacturer Warranty Description | 5 Year/100,000 Mile | | Model Number | E3.66 | | Number of Items | 1 | | Number of Packs | 1 | | OEM Equivalent Part Number | E3.66 | | Thread Size | 0.55 | | Top Material Type | Alloy Steel | | UPC | 894489000664 | | Unit Count | 1 Count | ## Product Details - **Brand:** E3 - **Core Material:** Copper - **Thread Size:** 0.55 - **Top Material Type:** Alloy Steel - **Vehicle Service Type:** Car ## Images ![Spark Plugs E3.66 Premium Automotive Spark Plug with DiamondFIRE Technology for Hemi Engines, 14mm, 1.000" Reach, Gasket Seat, Pack of 1 - Image 1](https://m.media-amazon.com/images/I/41shRHaPD-L.jpg) ## Questions & Answers **Q: Which spark plug will be for a 2014 ram 2500 6.4l hemi a e3.66 or e3.68 ? what is the difference?** A: We do not make a plug that fits a 2014 Ram 2500 with a 6.4L engine. **Q: does it fi 5.7 hemi** A: No clue , i have a 3.8 v6 in my 2010 jk . **Q: What e3 plug is compatible with the bpr5es plug?** A: The correct cross over to BPR5ES is E3.46. **Q: Is this $5.99 for one plug or for 4 plugs** A: For 1 plug. Four plugs would be $23.96. ## Frequently Bought Together - E3 Spark Plugs E3.66 Premium Automotive Spark Plug w/DiamondFIRE Technology (Pack of 1) - ACDelco Professional 9466I Spark Plug Wire Set - FRAM Extra Guard CA9054 Replacement Engine Air Filter for Select Chrysler, Dodge, and Volkswagen Models, Provides Up to 12 Months or 12,000 Miles Filter Protection --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.ec/products/1247625-spark-plugs-e3-66-premium-automotive-spark-plug-with-diamondfire](https://www.desertcart.ec/products/1247625-spark-plugs-e3-66-premium-automotive-spark-plug-with-diamondfire) --- *Product available on Desertcart Ecuador* *Store origin: EC* *Last updated: 2026-11-03*