An extended tip plug will probably run slightly cleaner in an old carbureted engine. Slightly more of the spark kernel will be exposed to the mixture giving you a cleaner insulator, especially in prolonged idle, staging situations. No reason not to use them. Everyone has their favorite brand, and anecdotal reasons why one brand is junk and another is God's answer to spark ignition. The Champion plug that "came apart" in your engine is the same Champion Spark Plug Company that has made ALL the ACCEL spark plugs since the 1960's. So anyone can have some defects. There is allot of love for AC branded plugs on this board, and I can understand that since they are OE GM. They have a high defect rate of the center insulator being crooked in the shell. I find about 10% of them having the insulator and center electrode so crooked, you have to bend the ground electrode over a significant amount to line them up. The NGK spec'd above is a pretty hot plug. Is there a problem with the Autolite 26's in the engine. How do they look?
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