E3 Diamond Fire Spark Plug E3.70 AS05521 1967-1973 GMC K25/K2500 Pickup

1967-1973 GMC K25/K2500 Pickup

Black anodized top hat

2003-2006 Cadillac Escalade ESV

sleeve nut & O-ringDerale has been the leader in performance cooling for decades

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E3 Diamond Fire Spark Plug E3.70 AS05521 1967-1973 GMC K25/K2500 PickupRace car drivers will tell you that the single sharp edge on spark plug electrodes wears out too fast for long term use. The E3 DiamondFire design presents multiple sharp edges to the circular sharp edge of the center electrode, which allows the spark to naturally seek the path of least resistance. The problem is that each time a spark jumps between two opposing spots of the electrode pair, the local resistance increases. After a few sparks, the local