I currently have 2 step colder NGK iridium plugs i thought where gapped to
.035 but instead they where .043 which is the stock spec for my motor. During my transmission build my original plugs where gapped to .035 but where fouled within the first 200 miles of being on my truck cause of the tune being too rich at startup. Well low and behold the transmission guy put new plugs in my truck but they are gapped to the stock spec .043
I had a feeling that the guy didnt gap them like i asked him to cause he kept avoiding the question when i picked up my truck..
Either way im having to disassemble the top half of my turbo kit on the top part of my truck to get the sparkplugs out which is a MAJOR BIT#H.

so my question is now what would happen from gapping them at .043 instead of the .035? I was just assuming maybe reduced performance but i really dont know.

 

Unless your truck has a high boost miss, I wouldn't fool with them if it's that much of a PITA. Unless you're running really high boost, I don't think a little extra gap will matter. Won't foul as easy either.

 

thanks for the comment, yea no misses here, just dont wanna hurt my motor is all, i dont mind taking everything apart to have this truck dialed in perfect

 

Wont hurt the motor. A closer gap allows for a less of a chance for the boost to blow out the spark. It makes a stronger spark. If you dont have a miss then prolly not an issue. But if it was mine, i would make the extra effort to make it right. Next time change the plugs yourself and you will know that they are right

 

Thanks.. now for the next question.. Haha iridiums or platinums? I know iridiums can withstand hotter combustion temps but are platinums alright to use?

 

My tuner from Procharger in KC said NO platinums! Iridiums or the ol copper cores. I run the NGK iridium TR6 IX plugs. 6.99 ea thru advance auto. I think the copper cores are something like 1.49 ea. Goodluck

 

No platiums.
The larger the gap the more energy is used to jump the gap. With boost vehicles or nitrous setups is the cylinder pressure is higher then na. The problem with large gaps and higher cylinder pressure it's easy to blow the spark out. The coil just cannot create enough voltage to jump the gap. So you close the gap down making it easier to jump. Like mentioned early if you donot have a miss let it ride.
If you notice a miss close it down.