On the topic of plugs, the most interesting change I noticed when I changed to autolite plugs was the very distinct drop in interference on the AM dial. The champions and motomaster plugs were really bad for this. James Robert Dervin wrote: > > Already tried the Autolite thing (3 different heat ranges), the Champion > thing, the Bosch thing, the retarded timing thing. Actually spent 55 > exhaustive hours on a chassis dyno logging and adjusting total advance with > a knock sensor and an exhaust gas analyzer. With this vehicle, Splitfires at > a .40 gap have the least amount of ping. Champions had the most amount of > ping. Ended up at 6 degrees BTC initial and 19 degrees total advance at an > early 1500 rpm. Logged 245 hp at the rear wheels @4200 rpm. > > Also installed a Pertronix electronic ignition module and a 40,000 volt > coil. >