ARP 8740 camshaft bolt for 2V or 4V 4.6 and 5.4 engines. DOES NOT FIT 3V or COYOTE ENGINES. Fits the SMALLER 10mm applications, check for fitment. Factory camshafts in later (99 and up) typically use this smaller diameter 10mm cam bolt. Older engines use the larger 12mm bolts. Most aftermarket camshafts utilize the larger 12mm size. Includes one cam bolt so please buy the correct quantity you need. 2 bolts needed for SOHC engines and 4 bolts needed for DOHC engines.