[KobaltBlau]

I have done a little research and it seems the SCs breaking valve springs is not entirely uncommon, as mine has.

A (mostly race) mechanic I know said that normally not just one spring breaks. In my case only one has broken, but I hope the rest don't go. He indicated that an overrev could cause several to break in succession. I don't understand how an overrev would break a valve spring.

My engine has not been overreved for at least 30k miles (no missed shifts), I think never. I have run it up to 7000 and perhaps even 7200 at DE events (just a few times, not all the time), and the car/engine has probably had a pretty quiet life prior to my ownership, where I imagine it was run up to 6 rarely. The spring broke during my ownership, but I noticed it well after DE season had ended, during street driving. I could have cracked or weakened it during a DE, though.

My hope is that I found a spring that had an original flaw or just fatigued faster in some way, by really exercising the engine.

But I'd love to know why people think valve springs break, and whether an overrev is a possible cause.

Thanks in Advance,