This question has been asked so many times, so I'm just gonna make this a sticky.

Stock Ac-Delco Plugs Gapped to .032. 41-108. 4 Of Them.

 

Ngk makes a good iridium plug. Thats all i run

 

Stock AC Delcos are made by NGK.

 

Yes i know. I usually run a step colder. Forgot to mention that. I also usually run higher boost then most

 

 

I run 28 psi and I use stock. I used one step colder once, engine sounded gurglly

 

Just did mine and went with stock Acdelco's.

 

Those seem to be the best for most anyone. Pay attn to the gap.

 

Indeed. Mine were off right out of the box. Use a feeler gauge.

 

Mine were all 030-032 out of the box so i didn't touch them. Quick install. Too bad I found oil on one plug during removal. No misfires or running rough. Hopefully just a spark plug well gasket.

 

compression test

 

Is there a 1 step colder option anywhere?

 

For lnf just the oem plugs

 

 

Nothing works better than OEM plugs for a lnf. Also sometimes its best to re-gap them to .032-.030 to avoid spark blowout when tuned or are tuned

 

He is trying to say you may need to regap plugs to .030.-032.

 

 

yup that just didnt want to give numbers because I didnt remember what it was lol

 

Spell check changed your "regap" to "regal", just didn't want him to get confused. I see you edited it.

 

Actually I've seen guys having problems with at the 600whp levels using copper plugs on a lnf and playing with gaps because of spark problems at high levels of boost

 

I started using ngk one step colder from stock. Same plug but a step colder. They work very well. Will post the number later

 

What was the reason from going one step colder? Are you stock or running some mods? I just bought the stock ones you posted originally

 

He has a big boy turbo

 

bet that thing is wicked

 

Like he said, big boy turbo with big boy boost lol. Definitely helps with knock in combination with direct port meth. Run 6 degrees timing more with direct port and one step colder vs stock and single nozzle on 94.