Hi guys. I pulled my spark plugs on my 312. I found that cylinder #’s 1,2,5,6 (the 2 front cylinders on either sided closest to the rad) looked pretty normal. Firing end and ground strap were clean and porcelain and ranged from a light tan colour to slightly darker. The last 4 cylinders 3, 4, 7 and 8 were considerably cleaner. The porcelain was considerably whiter and there was a small trace of white powdery crusty deposit. Is it running too lean? I mentioned last week under hard acceleration it pings slightly. Under normal driving conditions and moderate acceleration it does not ping. I am running a FlameThrower coil, Pertronix Ignition and plugs gapped at 0.40.



Thanks