Why are my distributor cap terminals burnt?

Here are the black and silver springs.

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A. Those are clearly different than the ones that were supplied by Mallory and MP.

B. Let's not put too much reliance on their graphs.

C. if you can measure the spring lengths, that will help a little. Calipers are great but just a side by side on the graph paper will provide a clue as to how much force to be expected.