Valve springs, what you need to know (from Hotrod Magazine)

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For those of you who do not subscribe to Hotrod Magazine, I found this article very interesting and educational. It's long, but packed with good info:
https://www.hotrod.com/articles/hrdp-1011-what-you-need-to-know-about-valvesprings/
*Be sure to look at the pictures. They add significantly to the information in the article.