---
product_id: 1247625
title: "E3 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: "€ 17.79"
currency: EUR
in_stock: true
url: https://www.desertcart.es/products/1247625-e3-spark-plugs-e3-66-premium-automotive-spark-plug-diamondfire
store_origin: ES
region: Spain
---

# DiamondFIRE tech for faster combustion Boosts fuel efficiency & lowers emissions Colder heat range prevents pre-ignition E3 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:** € 17.79
**Availability:** ✅ In Stock

## Summary

> ⚡ Ignite your engine’s true potential with DiamondFIRE brilliance!

## Quick Answers

- **What is this?** E3 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?** € 17.79 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.es](https://www.desertcart.es/products/1247625-e3-spark-plugs-e3-66-premium-automotive-spark-plug-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

- • **Unleash Peak Power:** Patented DiamondFIRE side-wire electrode delivers faster, more complete combustion for optimized engine output.
- • **Built to Last, Guaranteed:** Backed by a 5-year/100,000-mile warranty for long-term reliability and peace of mind.
- • **Drive Cleaner, Drive Smarter:** Reduces harmful hydrocarbon emissions and carbon buildup, aligning with modern environmental standards.
- • **Precision Fit for Hemi Engines:** 14mm thread diameter with 1.000" reach and gasket seat ensures perfect compatibility and performance.
- • **Cooler Operation, Smoother Ride:** Yttrium-enhanced alloy and colder heat range reduce side-wire temps, preventing pre-ignition and supporting performance mods.

## Overview

The E3.66 Premium Spark Plug features patented DiamondFIRE technology with a unique side-wire electrode design that enhances combustion efficiency, boosts power, improves fuel economy, and reduces emissions. Engineered with a colder heat range and Yttrium alloy for durability and performance, it fits Hemi engines perfectly with a 14mm thread and 1.000" reach. Backed by a 5-year/100,000-mile warranty, it’s a reliable upgrade for cleaner, more powerful driving.

## Description

E3 Spark Plugs E3.66 Premium Automotive Spark Plug with DiamondFIRE Technology for Hemi Engines, 14mm, 1.000" Reach, Gasket Seat, Pack of 1

## 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 |
|---------------|-------|
| Brand | E3 |
| Core Material | Copper |
| Gap Size | 0.04 Inches |
| Thread Size | 0.546 |
| Top Material Type | Alloy Steel |
| Vehicle Service Type | Car |
| Global Trade Identification Number | 00894489000664 |
| Automotive Fit Type | Vehicle Specific Fit |
| UPC | 894489000664 |
| OEM Part Number | E3.66 |
| Manufacturer | E3 Spark Plugs |
| Model | E3.66 |
| Item Weight | 3.2 ounces |
| Product Dimensions | 6.55 x 1.7 x 1.45 inches |
| Country of Origin | China |
| Item model number | E3.66 |
| Is Discontinued By Manufacturer | No |
| Manufacturer Part Number | E3.66 |

## Product Details

- **Brand:** E3
- **Core Material:** Copper
- **Gap Size:** 0.04 Inches
- **Thread Size:** 0.546
- **Top Material Type:** Alloy Steel

## Images

![E3 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)
![E3 Spark Plugs E3.66 Premium Automotive Spark Plug with DiamondFIRE Technology for Hemi Engines, 14mm, 1.000" Reach, Gasket Seat, Pack of 1 - Image 2](https://m.media-amazon.com/images/I/5180kYDNJFL.jpg)
![E3 Spark Plugs E3.66 Premium Automotive Spark Plug with DiamondFIRE Technology for Hemi Engines, 14mm, 1.000" Reach, Gasket Seat, Pack of 1 - Image 3](https://m.media-amazon.com/images/I/61HardZzprL.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.es/products/1247625-e3-spark-plugs-e3-66-premium-automotive-spark-plug-diamondfire](https://www.desertcart.es/products/1247625-e3-spark-plugs-e3-66-premium-automotive-spark-plug-diamondfire)

---

*Product available on Desertcart Spain*
*Store origin: ES*
*Last updated: 2026-03-04*