Yes. And they were rated to .600. Upgrade to duals good to .650. Manley, Pac, whoever. A little insurance goes a long way

 

I would replace them.

 

I just replaced my prc 650s cause I thought I was getting valve float. They had 15k on them, think I wasted my money, but put a better spring in place comp 675s. Piece of mind I guess.

 

Had I changed my valve springs sooner I would have gone faster a long time ago. Blamed converter for turning up boost and not running faster when springs were too weak for application.

 

I never would've dreamed springs would need changing after only 100000 miles. Heck they looked great and had great preassure when I changed cam a couple weeks back. What would be the symptoms of them going bad? Cause the truck is running better than it ever has right now.