It sounds as if you needed shims because your lash was too loose. That is not always the case, especially if you are using billett cams insted of re-grinds.stanggt00 said:Only because I just went through alot of headaches with my cam upgrades, and found out the hard way, I have to say YES, get the springs. When the machine shop was P&P'ng , they called Comp about re-using the springs. Comp said the springs were find and just set the preload to .080. That wasnt the case and I had to get new springs. Also, you may need a spacer for the cam gear, and for some reason in my case, I needed to have shims made for the lifters to avoid valvetrain noise.