item description
U-Groove design provides better ignitability for increased engine efficiency.
Features & Specifications:
No-compromise, top of the line race spark plug for the most serious enthusiast
Patented U-groove ground electrode design fires leaner mixtures than conventional plugs
Precision machine-rolled threads reduce seizing and cross-threading in delicate aluminum heads
Lasts twice as long as most conventional plugs
Withstands temperatures greater than 4000 Fahrenheit