E3 Spark Plugs E3.66 Automotive Spark Plug with DiamondFIRE Technology for Hemi Engines

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 14 mm. thread diameter and 1.000" 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. 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. The spark plug includes a unique ground electrode and full-size center electrode. The DiamondFIRE open design creates the preferred edge-to-edge spark path, resulting in improved engine power, reduced fuel consumption, and decreased carbon monoxide emissions.

Designed for a wide range of late-model applications, particularly Hemi engines DiamondFire technology enhances combustion efficiency and engine performance Delivers up to 12% more power and up to 13% better fuel economy in small engines More complete burn helps to reduce emission and minimize carbon buildup Built with Yttrium-enhanced alloy for durability and pre-ignition prevention Features a 14 mm. thread diameter and 1.000" reach This product is backed by a 5-year/100,000-mile limited warranty