What is the ideal gap for a SC3800 that is lightly modded. I have a 3.3 pulley, and an intercooler among a few other things.

Advice please.

The ideal gap is the biggest you can run without breaking up under boost. I believe the factory gap is around. 052. Back when I was supercharged, I was blowing out spark at that gap. I have since dropped it down to around. 038 with no adverse effects.

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'88 GT- 3800 Turbo 11.367@121.03mph
FOR SALE
GM Tuners

AL 103s gapped at .053.....

I asked couple weeks ago and was told .060 was stock gap. I went with .055 to be safe.

what would 104s be gapped at?

I'm using 104s with the gap mentioned above.

Is the 104 plugs hotter than the 103?

I believe that plug gap should be determined by the boost level that you are running. I am running Autolite 104's at .055 and have no spark blow out to 11 psi of intercooled boost. If the boost goes higher than the gap should be closer.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Flotech Afterburner Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "