With any luck, within the next month or, I'll be pulling the heads off my BBC to change these old tired springs. They have been on these heads for around 9 years now. They're motivated by a Comp Cams XR292R solid roller cam sporting .666 lift. I'm almost certain the springs I have now were made by Comp Cams and they have proven their worth to me. However, I know that just because the ones manufactured 10 years ago were great springs doesn't mean there's not something better available now or, Comp Cams quality hasn't gone down. Any suggestions or experiences would be greatly appreciated. Thanks in advance!