hey guys im looking to buy new plugs for the lnf what plugs would be good ones i have bolt ons and im tuned.. i know not all plugs a created equal lol....

 

just stick with the stock plugs and tighten the gap up a bit to .032 and call it a day

 

yep.

 

What ever you do, stay away from the autolite plugs. You will experience alot of misfires with them. Ac delco "stock" are te best I'd say.

 

first off some engines are different........... When i had my stock engine in and pushing 27lbs with a gap of .030 id get spark blowoutstill and kr. So i went with the one step colder ngks and i was fine, and when i tuned someone and i see this random kr but yet everythings perfect on my screen other then the kr, ill ask them to purchase the step one colder plugs and gap at .032 and if they have spark blowout go to .030. So since ive built my engine, my car doesnt like stock plugs gapped at .030 or anything, it likes the step one colders............ Each car is different, meaning compression , air fuel mixture (When your car commands say .89 lambda but your tune is off you will end up being leaner or richer so therefore making your cars spark different then someone elses, and same wiht the coil packs. If one coilde pack is getting a lot of resistance on the last winding where it creates the big sparkm itll end up making a shity spark to your plug which will cause a **** burn and itll cause the spark to blowout. I know im rambling, but the only thingyou can really do is test to see whats best.

 

stocks is what the mechanic ordered

 

yeah ive tested with autolites b.s the stockers gapped at anything possible and the ngks, and i had no issue with them, but i do recommending changing them every 10k miles for the (JUST IN CASE SINCE IM TUNED) SITUATION LOL

 

AC Delco (stock) or NGK's.

Anything else is very temperamental in GM engines.

 

i like ngk iridium 9!

 

Yeah I always use ac plugs all I own is chevys lol.. just making sure there wasn't something better for boosted engines thanks for all the info!

 

whats the gap meaning for the spark plugs?

 

The stock AC Delco's are NGK 5476, if you look at one closely you will see the number stamped on the barrel.
One step colder (my preference) are NGK 3787's.
Rock Auto was the cheapest last fall.

 

Rock Auto was the cheapest last fall
YEP.
BTW... They shipped me 8 BOX and charged me for 4

 

Yeah I went with the autolite and I think they are misfring gonna switch

 

but i do recommend changing them every 10k miles

10K????
I know these are *rated* for 100K...I'm not sayn that.... but I have 20K on my originals..tuned..and it runs perfectly. I plan on replacement at 30K mi.

 

what is the difference between NGK 3787's and 6509? modern is selling one step colder with 6509. what is 3787?

 

6509's are one range colder but come gapped to .044, it's outside of NGK's recommendations to close the gap more than .008", they work, but have to be very carefully gapped. I ran the 6510's (2 ranges colder) for a while at .032"

3787's are one range colder and come pregapped to .032, actually mine were closer to .031 out of the box. These are also the same style electrode as the OEM plugs. The 6509's & 10's are a bit different.

 

so beside the gapping difference between the 3787 and 6509, its pretty much the same plug but 3787 is oem laser iradium and 6509 is performance iradium?

 

Not pretty much the same plug. Different side electrode construction.

 

oh ok, i should be getting it this week.

 

not to thread jack but do i need a new log and tune after changing to one step colder? I am thinking about the NGK 3787?

 

You don't need the colder plugs from the pics in your other post. NGK 5476 are the stock AC Delco's.
If anything, yours looked a bit chilly from the color. Flog it more. lol.

 

Word, time to go punish her some more!!!, stockers it is and I think I will replace them just to cover my ass.

 

When tuned you can burn a plug up quickly even when properly tuned by say a tune like me, byt. And ect... I change mine just for less headaches..