DiamondFIRE Technology: Unleash Your Car's True Power with E3 Spark Plug E3.52 Premium Automotive Spark Plug (1 Pack) Review

Put them in my 1953 Chevy engine which has improved performance. The minute I started the engine I could tell these spark plugs were superb.

I tried the E-3 Spark on my 1970 Plymouth 383. I don't have a choke so I have to give it gas to start it. I don't pump with E-3 candles, they start faster and work much more powerfully with quick response.

According to the E3 homepage this is the correct spark plug for my 1969 Camaro 350. Amazon auto section shows "does not fit". I went ahead and got the spark plugs and they work great.

Starts right away, runs, idles smooth. Instant power. In general, they do what you expect them to do. They work PS - They really need to include more information in their ads and literature. It is impossible for a layman to determine which spark plugs fit which engine. rick

Not suitable for 67 gto. The ones that come out have longer threads and use a 5/8 socket. They pick up 13/16 and don't fit far enough in the hole to connect the threads. The E3 website shows this, but they are wrong. I've tried three times to add a photo but it gets blocked and forces me to start over. I hope I can come back

I used to swear by Bosch P4 Platinum spark plugs until I used them. Not to say the p4 isn't the best fork, but I've found that they don't make forks for a number of cars. I have used E3 plugs on my 4x4 and Nissan Maxima commuter with great results. Both showed improvements in gas mileage, power at lower revs and smoother idling. Of course, this is akin to a dirty fork, so do your homework if you're into productivity, but if you have a good fork that doesn't need to be closed, I'd give it a…

E3 makes great spark plugs. I put them in all my small engines (mowers, push mowers, snow blowers, weed cutters etc.) and they make starting very easy and reduce fuel consumption which also means fewer emissions/pollutants. Very happy with it in them. I have not used them on any vehicle as I am a firm believer that iridium spark plugs work for larger engines (cars, trucks, quads, boats) but they work great in smaller engines and I highly recommend trying them. .