Should I use Iridium one step colder? LFR6AIX-11
1-Normally Aspirated engine
2- Island temperature between 70 -95 Fahrenheit throughout the year…no cold winter!!
3- Constantly revving up the engine…not typical Sunday church trip.

 

N/A with normal mods heat range 5 is ok. Heavy mods or mild boost heat range 6. High boost heat range 7.

 

Thanks for the advice!!

 

I am also looking for spark plugs.
Is it true if i go for one step colder I need to get the car tune or it's not save?
Thanks

 

TTRANK, what could be an example of a "heavy modified" N/A engine?

 

Where is the cheapest place to get these?

 

I have done a lot of research.

Ebay is the cheapest...as of today!!
Just research the spark plug number and voila!