jbsblownc5

Morning Guys,

For those that have thrown on a upper or lower pulley, along with a few other bolt ons, making another 120 HP or so, did you swap plugs??

If so, what did you go with??

I'm currently still running the stock plugs, car runs fine, just curious what others are doing with plugs??

Thanks in advance!!

onfire

Not a guru, but I would do what you are doing and see what others are using. I would definitely drop down one or two heat ranges and use iridium. Then make a wot blast and read the plug. That is the best test to verify the timing mark and heat mark for your combo. I used that method on my other street car below while tuning it and it has worked great for 8 years.

https://m.youtube.com/watch?v=bYcM0S...ature=youtu.be

jbsblownc5

Thank you, Do you know the heat range # for the stock plugs??

onfire

Sorry, I don't. I would call Vengeance and order what they recommend. If it were an LSX at your cylinder pressure, I'd be looking at a TR7ix which should be a LTR7-ix heat range for you. Best to buy from experience then test/read to verify.

jbsblownc5

Thanks for the lead, called Vengeance today, and spoke to David, he did recommend the NGK LTR7IX plugs, as well as their 180 Stat swap out, ordered both, and they shipped today!!

HNK

Joal, did he tell you where to gap them at??

jbsblownc5

Yes, as I thought, leave them alone out of the box...

onfire

Very very high cylinder pressure, I have dropped them to 0.030". But they are tricky to gap without harming the plug. You'll be fine at your cylinder pressure and the stock gap of 0.043".

jbsblownc5

Thanks Bud, I'll double check the gap out of the box, if it is that high, I'll drop them back a bit...

Yes, you have to be VERY careful with these plugs.