[BobBray]

What is the general consensus on spark plugs these days? For a long time I was running the specified AC C44NS commercial plugs in my 351E. Even though obsolete, they were readily available on Ebay fairly cheap. Truck ran O.K., but it did tend to run on a bit shutting off when good and hot like after a long drive in traffic. I was thinking the plugs might be a little too 'hot' for non-commercial driving. I changed the plugs to the currently recommended platinum AC 41-828, gapped at .040. Runs better! Quiker starts, smoother hot idle and no run-on. I do have a Pertronix ignition with their 3.0 ohm 'Flamethrower' coil, so I am sure the increased gap is not an issue. The old C44NS showed no fouling, oil or excess carbon deposits, insulator tan, end of electrode gray, moderate gap increase.