U-Groove ground electrode design gives the flame a groove to grow in, resulting in less flame dissipation and a larger flame front for a more complete combustion. This translates to better fuel efficiency and improved throttle response.
Denso u groove spark plug
Machine rolled threads prevent seizing or cross threading during installation and removal
100% pre-fired to assure the highest quality possible
Purified alumina powder insulator provides exceptional strength and thermal conductivity
Five rib insulator prevents flashover
Copper-glass seal bonds center electrode and insulator for a gas-tight seal
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