NGK (3186) TR5GP G-Power Platinum Spark Plug, Pack of 1

I went against several "expert" opinion in terms of using NGK spark plug in a Chevy C-3500 Dually which had AC-Delco Platinum in its 7.4 liter big block. I was told it would have performance issues, miss fire etc. Well, I have none of that after having driven almost 1000 miles & my engine sounds more effortless across all rpm.

I was able to get 440 miles out of a full tank of gas which took 33.5 gallons to fill-up; this translates to 13.13 mpg. Thats about 1.6 mpg better than I'm use to getting with the stock AC Delco plug. (I run 5w-20 Mobile-1 synthetic, that helps too)

Word to the wise: Don't take the gap from factory for granted, gap them properly before installing them. My vehicle required 0.060" but these plugs came from factory way under that.

I cross examined NGK, AC-Delco, Autolite plugs before settled on the NGK as it has the highest build quality, fit,finish & tolerances are also better. If you hold up an Autolite & AC-Delco plug...Read more

It NGK so its a top quality product. i put it in my GMC and my fuel effiency went up by 125 miles, my ac/delco's were on thier last firing pin. what a differnce new plugs and wires made. no stall, no sputtering.

NGK plugs for my 1999 Taurus. Nothing but NGK. Best plugs on the market bar none.