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X 3 or four for fuel being pulled out of the vent tubes. I'd be interested to know what you run for an air cleaner. I had a 440 '70 Challenger that would do the same thing (on a hot day). Had a mild 440 that would always run cool but on a hot day I'd pin it and maybe 10 seconds later the engine...

Wow Bill that is an incredible article on reading plugs. Sonny I think I'd go back to your original combo but try it without the vacuum connected to the vacuum advance. I've seen some vacuum canisters add a huge amount of additional timing on even a small vacuum signal, so fine-tuning the vacuum...

First I'd like to know what your original (hotter) plugs looked like? If they were burning clean all around, and if you've made no other changes, then what I'm thinking is changing to cooler plugs has exposed a basic weakness in your engine combo. What I mean by that is a hotter plug may have...