Spark Plugs

Pancho · April 7, 2004

I am getting ready to change out my plugs. I am currently using the Champion Truck Plug #4013's. I see many of you run the NGK TR6 or TR55. I have also seen the NGK Iridium plug. Is there any concensus as to what is best?

black&grayHD · April 8, 2004

If I'm not mistaken, the TR6 plug is for NOS, or supercharged engines, while the TR55 is good for all others. The Irridium plugs are more expensive, but last longer.

Chevyfreek · April 8, 2004

I have been runing the NGK Irridiums in my truck for over 10,000mi now and they work great. Still running the factory wires. I have almost 60,000mi on my truck. No problems at all. They are supposed to last a long time.

Pancho · April 8, 2004

Anyone willing to provide their reasoning for using the NGK T55 over the Iridiums or vis versa? I can't say that I am unhappy with the Champion Truck plug but if there is something better I'm up for giving it a try.

Chevyfreek · April 8, 2004

I went with the irridium for the longer life of the plug. That is basically it. I don't think you will notice a gain in performance over what you are running now unless you have a partially fouled plug now...

linda · April 8, 2004

how about the direct hits ignition plugs? I am looking into putting on a new Volant and direct hits, but im wondering if the direct hits is worth the $275. Anyone out there running them that could feel a difference in performance?

2001 HD · April 9, 2004

$275.00 for plugs??? I hope that's the price for the Volant and the plugs. Most people here are using NGK's. Mine came with Platinum NGK's from the factory. I tried a set of Bosch Platinum 4's but took them out after about 30K miles. Seemed to make it run a little richer even though they were direct replacements. I put the NGK'S back in and my tailpipe isn't as black.

Whatever you switch to, use a little "neverseize" on the plug threads. I haven't heard anything about the Direct Hits Spark Plugs, but in my opinion, I like to stick with companys that have been making spark plugs a long time. I never have been much for "Snake Oil". A new set of Platinum plugs should run about $36.00. Irridium a little higher.

linda · April 9, 2004

Click on the "IGNITION" tab on the left and scroll down this page 2001HD, and have a look at the direct Hits ignition. That is what i was refering to.

http://www.tbyrnemotorsports.com/81truckcatalog.html