PAC valve springs

Yes to the above. And if they’ve not had the snot revved out of them, it’s perfectly fine to reuse them. Just as long as they can be shimmed back to specified seat pressure and still have enough room to open. Generally, it’s safer to reuse dual springs than single springs. If a coil breaks on a dual spring, you’ll have valve float sooner and not be as likely to have a valve and piston collide. You won’t be so fortunate breaking a single spring.