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If your SC was one of the first 1,000 '78s built, replace all of the springs when possible. I documented this in my book a few editions ago, because I believe Porsche's spring supplier sold them a bad batch. What's happened in the last 10 years (since I sold my shop to Marc), is another story, but apart from the very rare spring failure in other cars, even well-maintained ones, nothing more can be said other than sooner or later everything will break.
John's comment in Post #15 above is right on the money. The vast majority of broken springs that we found were intakes. And Steve's recommendation, to push on every valve before adjustment, was also correct. My guys all were sensitive to a spring that no longer developed the correct tension, and occasionally we found a broken one.
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Keep the Shiny Side UP!
Pete Z.
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