Gear drive. .630" intake; .630" exhaust valve lift. Camshafts come without inner & outer drive gears. Large displacement high performance engines with head work & high compression ratios. Serious performance cams with still stock like low-end performance. Vicious power gains in mid and top-end RPM range. Streetable 2500-6900 RPM power band. Note: These high lift cams come with smaller base circles and will therefore require adjustable pushrods to compensate for the additional length required. 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.