What gap are you running on your autolite 104's, and aren't they 1 heat range degree colder than the stock spark plugs? thanks ello

 

I used to run the 104's. I have since moved to the 103's with the 175 shot. I run a .040 gap with the nitrous on both plugs. Runs great NA and on the dope at that gap. 104's are 1 heat range cooler, 103's are 2.

 

I run mine at .040, good plugs.

 

I've seen them between .035-.040. I have mine set at .038