These Pro-Series cam bolts have increased pre-load clampingforce to assure positive timing gear register. Their increasedmaterial strength overcomes valve train harmonics and stress. Thesecam bolts have a reduced head size that makes installation andremoval easier. Rated at 190000 psi these pro-series cam bolts areready to do the job.Cam Sprocket Bolt KitPro Series1 per Cam RequiredInstall an ARP cam bolt kit and end your camshafttiming worries! ARP quality delivers increasedpre-load clamping force and assures positive timing gear register.Includes appropriate fasteners for your application. Increasedmaterial strength overcomes valve train harmonics and stress. Addedfeatures include oversized bolt head flange for cam buttonretention and reduced socket head size to facilitate easyinstallation and removal. Available in both High Performance andPro Series kits.