GeforceXtreme

Most likely beating a dead horse here but should I just stick with the AC Delco ACDELCO 41108 gapped at .035. Car is running perfectly fine just like to change out the plugs which I have no idea how many miles are on them. I have heard of some going with NGK reason I ask. I have always been a fan of AC Delco plugs.

Mods are what is in my sig + now Hahn Intercooler + upper charge pipe.

emiller

Stock plug and stock gap. NGK makes the plugs for ac delco.

tomj77

iTrader: (2)

Stock and nothing else

09CobaltSS1

Stick with the stock plugs but tighten the gap a bit with a tune. Close the gap to .032 and call it a day.

Iam Broke

iTrader: (10)

NGK 5476 are the stock plugs OP. NGK 3787 are 1 step colder.

GeforceXtreme

I forgot to say I pulled one of the current plugs to see what the car had.

It has 4344 LTR5IX11 Iridium IX plugs in it.

Iam Broke

iTrader: (10)

Same heat range as stock, (5) but wrong style, those come gapped at .044 out of the box and if they are gapped down to .030 the electrode is stressed and not perpendicular anymore.

NGK 5476 is what you want. They are the stock plugs. AC Delco puts their name on them from NGK.

GeforceXtreme

Thats great to know. Be interesting to see what the gap is sent to when I pull them out soon.

I suspect the AC Delco plugs I have bought will already be pre-gapped to the correct size my engine needs? I hate having to deal with gapping.

Mxman38

is Anything Recommended For e85?

09CobaltSS1

NEVER assume a plug is "pre gapped". Always always always check plug gaps before installing them in an engine. 50% of the time the gap is either off in one direction or another, and the gaps across the board are inconsistent.

Stock heat range plugs are perfect for e85 due to the natural cooling effects that alcohol (e85) has in engine combustion. You can go one heat range colder, but there's just really no need for it imo.