Originally Posted by 4 Jaw Chuck
You can't read those in the conventional sense of the word, use a standard set of plugs and switch over when you get it right.
I had normal plugs in it for several years and they read a little rich, which is where I want it for detonation margin.
The previous set of plugs got majorly fouled when I had a stuck-open float valve and had to drive the car about 10 miles with clouds of black smoke pouring out the side pipes to get it home. I was too lazy to try and clean the plugs and it's only a block to Autozombies, so I popped down there and picked up the E3s just out of curiosity. I didn't really expect any noticeable changes in performance, and that was certainly the case.
I e-mailed the pic to E3 this morning. We'll see if I even get a response! I'll let y'all know.