Help Me Read These Plugs
 

The pics are Autolite 103's I had in my cam only LS3. I used them in my old high compression LS1 build but I think they're too cold for this setup (they're same as TR6's) I switched to Champion Copper 408's which are stock heat range plugs for an LS3. So do the plugs look too cold for you guys as well? The plugs were on the car about 1500 miles since I put the motor together. Ive since adjusted the timing (less of it, 28* wot) and fuel, 12.8-13.0afr wot. I don't drive long distances and I think the cooler weather as well made it worse, cold plugs couldn't burn off all the carbon.

Some info,
LS3, stock block and heads
TSP 231/236 114lsa
LS1 coils with Taylor 8.5mm LS3 plug wires

I was seeing 28* timing at wot so I know the ecu wasnt pulling any timing and I didnt see any knock retard either. No blowby, doesnt use oil and oil looks clean. Plugs were dry also when I pulled them.

Many pictures on those type of charts are either vague, low resolution so you cant see, or extreme cases. The ones in the link posted are a bit better. I just wanted to see if others agreed that they seem like plugs that were too cold for the motor. Also think the orange brownish color is from running octane booster at the track.

They look normal to me. What fuel are you running? This is one of the plugs I pulled from the Cobra with about 5,000 miles on them.

It's too hard to tell the heat range with that many miles on them. Put a new set in make a quick pass and them inspect them. The red/brown color is why I asked about the fuel. The additive would be the cause.

Use NGKs this time, heard too many horror stories with Autolites.

I used an octane booster before i fine tuned the car. I think that caused the orange color. Car only sees 91 now, mostly chevron. Ill do a quck wot run with the new plugs and then check them out.

Thats all ive ever used with no issues. Theyve always looked like new after months of driving. We will see with the champions now.

I see red, what kinda fuel additives are you running?