Billet Eagle Cam Gears are the standard replacement gear for three bolt high performance camshafts. They bolt right on to all after market racing camshafts. Billet Eagle Cam Gears can also be used to repair damaged gears on stock camshafts. Converting a stock "rivet on gear" simply requires drilling and tapping of the camshaft. Every Billet Eagle Cam Gear is manufactured from Billet 6061 T-6 Aluminum to the highest quality standards in order to assure trouble-free valve train performance.