E3 Spark Plugs

12-25 Ram / Durango / Jeep Grand Cherokee 6.4L 392

E3.74

The E3.74 Automotive Spark Plug is the perfect upgrade for your vehicle. Designed with E3’s innovative DiamondFIRE technology, this plug creates a more complete and efficient burn, resulting in increased power, improved throttle response, reduced fuel consumption, and lower emissions. Built with a 14mm thread diameter, 1.000" reach, and taper seat, the E3.74 plug ensures a secure, OEM-style fit. Its unique three-legged ground electrode stabilizes the DiamondFIRE tip and provides exceptional heat transfer and combustion turbulence. The fixed gap means there's no need for adjustments, ensuring consistent spark and optimal engine performance. Backed by a 100,000-mile or 5-year performance guarantee, the E3.74 is a reliable, high-performance replacement for demanding HEMI engines.

• Patented DiamondFIRE Technology: Increases spark efficiency for better power, fuel economy, and cleaner emissions
• Three-Leg Ground Electrode Design: Secures the tip while promoting enhanced cylinder turbulence and faster heat transfer
• Fixed DiamondFIRE Gap: Pre-set spark gap ensures reliable ignition with no manual adjustment needed
• Built for Longevity: Delivers dependable performance for up to 100,000 miles or 5 years
• OEM-Compatible Specs: 14mm thread diameter, 1.000" reach, 5/8" hex size, taper seat
• Environmentally Friendly: Helps reduce hydrocarbon emissions and support cleaner engine operation

E3 Spark Plugs uses its patented DiamondFIRE design to target efficient combustion and consistent ignition performance across automotive and racing applications. For performance builds, a quality spark plug choice can support clean burn characteristics and reliability—especially when tuning for higher cylinder pressures or more demanding driving conditions.