Aluminum Valve Spring Retainers

With modern options I can't think of a reason to buy new ones on purpose. I still have them on My built Slanty w/the DC Red 340HP singles & dampers, pounded & revved
the piss out of 'em & drove the car year 'round for nearly 8yrs. I'll still use them w/those springs, but nothing more, I think that's as much as I'd trust them holding long-
term. Only issue I can see is the wound damper scratched the anodizing off,...............................