Here you can find the specs for the Autolite 103 spark plugs from sparkplugs.com web site.Well shoot. I just got them a few months ago. Was going to order spark plugs today. Wonder what threads they are. Im at work and guessing every vendor is closed today.
well what did you pull out ??Says they are 14mm. somebody said the new heads are 10mm? i need to confirm.
Its a brand new build. trying to get the last few things i need to install the motor and get her running.well what did you pull out ??
Different plug. My engine like the autolite 104s vs 103s.
I went and checked them on my lunch break. My 3 month old GN1 heads have 14mm thread spark plug holes.
Different plug. My engine like the autolite 104s vs 103s.
what did you notice about the 104 vs the 103s? How did it like it better?
My stock longblock @ 35psi on e85 ran best with stock heat range plugs too. no knock. I tried colder plugs and it ran noticeably rougher and I fouled a couple of them in short time.