Has anyone had any bad issues with these valve springs? My cam is 591 lift, and these springs have a .620 max lift. These should be great springs, but wondering if anyone has broken one before?

 

Thirty seven sets in use and not a single complaint. I don't want to imply that one or two won't break, because all springs are manufactured in large batches and there is the very real possibility that several can fatigue or even break, but your chances are much better using two springs instead of one.
Good luck,
Richard <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

 

Well I guess I have the first complaint. They sent me a bad retainer. the hole was drilled out to damn big. As far as the springs they are doing ok so far.