Description
Stop guessing on heat ranges. 797 Performance has mapped out the correct NGK spark plug specs for every Hemi engine variant — so you get the right plug, right fit, right heat range, every time. These are direct OEM-replacement plugs with no modifications required. Additional heat ranges are available for boosted or nitrous applications.
Engine Fitment Guide
5.7L Hemi — Non-VVT (Pre-Eagle)
- Years: 2003–2008 (varies by platform)
- Heat Range: 5
- Seat Type: Taper Seal
- Vehicles: Dodge Ram 1500, Dodge Durango, Jeep Grand Cherokee, Chrysler 300
5.7L Hemi — VVT (Eagle)
- Years: 2009–present (varies by platform)
- Heat Range: 5
- Seat Type: Washer Seal
- Vehicles: Ram 1500, Dodge Charger, Dodge Challenger, Chrysler 300, Jeep Grand Cherokee, Jeep Wrangler, Dodge Durango
6.1L Hemi SRT
- Years: 2005–2010
- Heat Range: 5
- Seat Type: Taper Seal
- Vehicles: Dodge Charger SRT8, Dodge Challenger SRT8, Chrysler 300 SRT8, Jeep Grand Cherokee SRT8
6.4L Hemi 392
- Years: 2011–present (varies by platform)
- Heat Range: 6
- Seat Type: Taper Seal
- Vehicles: Dodge Charger Scat Pack/SRT, Dodge Challenger Scat Pack/SRT, Jeep Grand Cherokee SRT/Trackhawk, Ram 2500, Dodge Durango SRT
6.2L Supercharged Hemi — Hellcat / Demon / Redeye / TRX
- Years: 2015–present (varies by platform)
- Heat Range: 6 (stock boost) — Heat Range 7 recommended for modified/high-boost applications
- Seat Type: Washer Seal
- Vehicles: Dodge Charger Hellcat/Redeye, Dodge Challenger Hellcat/Redeye/Demon, Jeep Grand Cherokee Trackhawk, Ram 1500 TRX
NGK Plug Technology
Iridium IX®
The go-to performance upgrade for naturally aspirated and mildly modified Hemis. Iridium's extremely high melting point delivers outstanding ignitability, throttle response, and longevity over copper plugs.
- Fine iridium tip for stable, consistent spark
- Superior anti-fouling and anti-corrosion properties
- Improved throttle response and fuel efficiency
Laser Iridium®
OEM-spec iridium plugs engineered to OEM tolerances. Laser Iridium is the factory-spec choice for many Hemi applications, featuring fine wire center electrodes and high-grade alumina silicate ceramic for long service life.
Ruthenium HX™
NGK's most advanced plug technology. Ruthenium HX delivers superior ignitability and oxidation resistance, making it an excellent choice for high-demand Hemi applications.
- DFE & PSPE® tip designs for maximum ignitability
- Superior oxidation and anti-peeling resistance
- Advanced high-ignitability technology