Im searching a new spark plugs for my 2003 lightning,i didnt find the stock, so which is good for a colder heat range spark plug to help compensate for the additional heat inside the combustion chamber due to the extra boost.....also the upper pulley size?.....thanks

 

A search for 'spark plugs' will turn up literally thousands of results...but an NGK TR6 is a good place to start for a truck with a 4 lb. lower (and some trucks running uch more boost have sucessfully used them). Much cheaper than the Denso Iridiums but you could go that route too.

 

^^^ werd

 

What they said ^^^

 

what about the NGK TR6IX Iridium Spark Plug 3689....do u think the heat range is good for the lightning???thanks

 

depends on how much boost you are pushing

 

i just wanna keep as the stock boost,so no changes.