NGK 3951 Spark Plugs TR55 (8 Pack)

These NGK spark plugs are great quality and worked perfectly for my vehicle. Installation was straightforward, and the engine runs smoother and starts easier now. I noticed better fuel efficiency and overall performance compared to my old plugs. A solid value for a full pack of 8, and NGK is a brand I trust for reliability. Definitely recommend!

These are great plugs. I usually work on Japanese stuff and since I'm always happy with NGK, I decided to get these for a GMT400 1999 Chevy Suburban with the 5.7 Vortec. The 60 tho gap is recommended by GM, but I was chasing a misfire issue and ended up lowering these to 50 tho to be a little easier on the aging ignition system. These plugs are so efficient they actually made the misfire worse since all the cylinders are actually trying to fire now. Anyway, after throwing all the parts at it, my main issue ended up being the distributor rotor. But the old girl did desperately need plugs and these have been working very well for a few thousand miles now. They have a perfect brown mark on the edge of the porcelain as one would want.Long story long, very happy with these. Don't be afraid to put them in a domestic vehicle.

I am thoroughly impressed with the NGK 3951 Pack of 8 Motorcycle Copper Spark Plugs (TR55) for several compelling reasons.Firstly, NGK's reputation for quality precedes them, and these spark plugs live up to the brand's renowned standards. The copper core design ensures excellent conductivity and heat dissipation, which is crucial for maintaining optimal engine performance and longevity.Secondly, installation was a breeze. The plugs fit perfectly into my motorcycle's engine without any issues, thanks to NGK's precise manufacturing and adherence to OE specifications. This made the replacement process straightforward and hassle-free.Thirdly, performance-wise, these spark plugs have significantly improved my motorcycle's engine responsiveness and fuel efficiency. Whether I'm cruising on the highway or tackling challenging terrains, I've noticed smoother acceleration and consistent power delivery throughout the RPM range.Moreover, durability is another standout feature of these spark plugs. They have demonstrated exceptional longevity, holding up well under various riding conditions and environmental factors. This reliability gives me peace of mind knowing that my bike's ignition system is in top-notch condition.Lastly, the value for money is undeniable. With the NGK 3951 Pack of 8, I received a cost-effective solution that not only enhances performance but also offers long-term reliability and durability.In conclusion, if you're looking to optimize your motorcycle's engine performance with a set of spark plugs that deliver on all fronts—quality, performance, reliability, and value—look no further than the NGK 3951 Motorcycle Copper Spark Plugs (TR55). They have earned my highest recommendation without hesitation. Five stars!

The plugs are guilty and work just like expected. They arrived on time and I will definitely order them agIn.

Good value. Replaced (6) in a 2004 silverado 4.3 with the same plugs with 75k miles on them. Price was good for 8.. leaving 2 spares for future.

OEM TR55 plugs. What more can you ask for?! I use these on almost all naturally aspirated LS based v8 engines

Work

I only use ngk on coil over plug. Consistent accurate heat range ensures longest coil life.