Iridium TT™ Spark Plug (4716) by Denso®. Ultimate Endurance and Power. 0.4 mm Iridium and 0.7 mm Platinum Twin-Tip Technology. Make your vehicle faster and more powerful with premium-quality performance fuel system parts stocked on our website. Manufactured using the highest grade materials and the latest technology, they deliver the ultimate in performance and dependability. They will help increase the fuel flow and ensure you have the fuel pressure you need to get the most out of your vehicle. The fuel system parts we showcase are highly resistant to wear and tear and will surely serve you for years to come.
These plugs are rated for long life high miles and are one of the top firing plugs you can get. they also are designed to fight rust and corrosion so they will be easier to maintain. I would put these plugs in every equipment I have if possible. I use them in my Pontiac Vibe and it runs great. these plugs I bought for my GMC 1500 5.7 L 350 and while I have not run it long I fully expect it to give every thing the old truck can deliver and since I do the maintenance on it I won't have to do it very often if ever again. I also replaced the coil cap rotor and plug wires to get the most out the ignition system. I think that what I spent on all the new equipment could have been paid out to a mechanic for one tune up but with stock equipment so by doing it myself it gave me a great upgrade and hopefully great performance to back it up.