Gear drive. .525" intake; .535" exhaust valve lift. Camshafts come without inner & outer drive gears. Bolt-in. Great workhorse for stock 88/96 and mild 103" strokers with stock springs; pushrods etc. Smooth cam lobes for less wear and tear on the; quiet; valve train components; increased fuel economy and torque. Responds well to head work and compression increase. Linear power band 1750-5500 RPM. 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.