Gear drive. .574" intake; .574" exhaust valve lift. Camshafts come without inner & outer drive gears. Bolt-in for 96/103/110". All-round performance cam with smooth cam lobes; performance pushrods & lifters recommended but not required. 99-04 TC 88/95 require high lift valve springs. Responds well to head modifications & higher compression ratios. Note: Gears must be purchased separately. Installation is a simple press-on installation. If you have gears from your current; Andrews or S&S gear drive cam; these can be re-used or a new S&S set (531264) purchased. Note: Block-off plates 566113 are sold separately. These are required to block-off oil holes for hydraulic chain tensioners when gear driven cams are installed.