MMR's Billet Steel Adjustable secondary gears offer the most adjustment and strongest gear available. Features: Fits 1996-2004 Ford 4.6 DOHC Fits 2000-2014 Ford 5.4 DOHC (including GT500) Heat Treated Billet Steel Construction Multi Keyway design adjustable in 1 degree increments Includes 4 Gears (2 non adjustable gears for exhaust cams and 2 Adjustable gears for Intake cams) Made in USA *Adjusting and degreeing cams takes special tools and knowledge. This product is intended for qualified engine builders. Incorrect adjustment of ANY camshaft gear can result in engine damage. Always check for piston to valve clearance.