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If you followed the article to the letter, there is no way it should have a spark knock.
Did you scroll all the way to the bottom and go by my HEI Tips. I used both blue springs in my old distributor. The one blue and one silver wouldn't work for me either. The blue/silver setup I feel works good for lighter cars, but with these heavy trucks, I couldn't get it to work for me either. Use both blue springs.
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