8× TR5IX 7397 NGK Iridium IX Spark Plugs Set Ford Holden Jeep – High Performance Ignition Upgrade – NGK Iridium IX Spark Plugs
Revhigh’s 8× TR5IX (7397) NGK Iridium IX Spark Plugs Set is designed for Ford, Holden, and Jeep engines that require the 7397/TR5IX plug, delivering superior ignition performance and reliable spark under demanding conditions. Perfect for enthusiasts who want smoother idle, better throttle response, and enhanced durability, this upgrade combines NGK’s Iridium fine-wire construction with a tapered cut ground electrode for proven performance in both stock and lightly modified engines.
Key Benefits• Improved Ignition & Throttle Response – Fine 0.6 mm iridium tip and a tapered-cut ground electrode give quicker, more consistent spark, improving acceleration.
• Better Fuel Efficiency & Reduced Emissions – More complete combustion thanks to higher ignitability and stable spark under load.
• Longer Life & Durability – Iridium center electrode longer lasting vs standard plugs; good resistance to fouling.
• Australian stocked, fast shipping – Parts held locally to reduce wait times.
• Backed by Revhigh’s expertise – We’re performance tuning specialists with knowledge to ensure proper fitment & setup.
Specifications at a glance:
Thread Size: 14 mm O'Reilly Auto Parts+1
Heat Range: 5 NGK+1
Resistor: yes, approx 5 kΩ Spark Plugs+1
Gap: ~1.0 mm (pre-gap) AutoZone.com+1
Hex size: 5/8″ (16 mm) O'Reilly Auto Parts+1
Suitable reach and seat: tapered O'Reilly Auto Parts+1
Vehicle Fitment Guide
(You’ll want to verify in vehicle manuals or parts-lookup because “fits Ford, Holden, Jeep” can vary a lot by engine model.)
Why Choose Revhigh?
- 10+ years specialising in performance tuning and upgrades
- Workshop and online store – real experts, not just resellers
- Customer support before and after purchase
Shipping & Returns
Fast, insured shipping Australia-wide with tracking
Express postage available upon request
Worldwide shipping options available – contact us for a quote
Returns not accepted once parts are installed or used
