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With my 3.1 pulley, what spark plugs to run?

97AutoXVette

97AutoXVette

New member
I am currently running AL104s. With my 3.1 pulley, should I drop to 103s?

I see small blips of knock here and there but it may be due to being slightly rich at times. Still playing with fuel tables a bit and dialing it in after my latest mods (rockers and pulley swap)
 




It can indicate the temp. If they are nice and white is nice and lean. Golden is a good range, dark Brown or blackish will be too rich. Too rich indicates you should go a little warmer. Too Lean would be a little cooler.
 
Ah ok. I knew the dark was rich and light was lean Just didn't know how that applied to temps. Good to know!
 
Iceman6669 said:
It can indicate the temp. If they are nice and white is nice and lean. Golden is a good range, dark Brown or blackish will be too rich. Too rich indicates you COULD go a little warmer. Too Lean COULD be a little cooler. Obviously this is dependent on a proper tune.
Click to expand...

Edited before the tuner guys get here. LOL
 


It's the hottest spark you can get away with, no the coldest.

I just run cold plugs with a small gap because I'm lazy AF.
 
Sounds like I should maybe stick with my 104s for now and just monitor knock. If I continue to see blips here and there maybe I'll give 103s a shot to see if it takes care of it
 
Great info.... right now with the VS cam, tune @ 18* timing they are that grayish color. I'll swap the 3.4 on throw in the 104 ' s and take the timing back down and slowly work it back up then read the plugs again. I keep saying the 3.4 is enough for my DD but I keep looking for a 3.2 to come up for sale. It never ends.
 


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