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J.E. changed the forging and no longer supply the tapered pins. These two changes were done at the same time, so it is hard to say which one(or both) caused the issue.
What did your pistons weigh in at? Any undercrown milling done to reduce weight. It doesn't look like it from the pic.
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Aaron.  F.S. 1965 Solex engine w carbs/cleaner
Burnham Performance
https://www.instagram.com/burnhamperformance/
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