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Denso Iridium Race Spark Plugs

This is our secret weapon spark plug for high horsepower direct injected LNF, LHU, and LTG cars (500+whp) where we start to have issues with the electrode burning off.  This has a different style tip which doesn't burn off and cause valve train/piston/block damage like the other plugs can.

Iridium Power® plugs are for drivers that care about performance as well as drivers that care about mileage. These plugs best demonstrate their performance improvement during acceleration. The world's smallest center electrode (0.4mm) and specially shaped ground electrode delivers maximum spark energy while withstanding temperatures greater than 4000º F. These features combine to achieve higher ignitability and require lower spark voltage than ever before. As a result, acceleration improves in comparison with normal plugs.


  • Tapered cut, U-Groove ground electrode
  • 0.4mm iridium center electrode
  • 360-degree laser welding assembly process
  • Required ignition voltage reduced
  • Unsurpassed center electrode durability

These work in LNF, LHU, & LTG

Comes in a set of 4.

Customer Reviews
4.8 Based on 16 Reviews
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Harvey C.
United States

Hi , have received the plugs, but seems that I have to replace the engine pistons!

Derick F.
United States United States
Hard to find anywhere else!

Hard to find anywhere else! These are perfect for Full Bolt on E85 ATS. Engine runs very smooth after adding with proper gapping. ZZP was great answering my questions and providing the proper gapping based on my mods!

Randy M.
United States United States
A must upgrade

So far so good no complaints

Brian A.
United States United States
2021 2.0 LTG Denso ITV24's

Nice little upgrade, helped mpg's a little and smoother running than the oem Delco. These were a little shorter than factory plugs but it all worked out great, gapped mine at .034 as I am not tuned yet.

ZZPerformance Denso Iridium Race Spark Plugs Review
Scott T.
United States United States

No issues so far. Did not effect idle quality