These camshafts have a 3-bolt timing gear pattern. Brian Tooley Racing's Truck Cam Kits are an excellent selection for GM trucks and SUVs equipped with 4.8L, 5.3L, 6.0L, or 6.2L engines. These camshafts are designed to increase power without sacrificing low-end torque and are great choice for heavier vehicles such as Silverado, Sierra, Yukon, Tahoe, Suburban, Escalade, etc. Brian Tooley Racing's truck cams were designed with low lift so BTR's standard beehive springs and OE pushrods can be used, making these the most affordable truck cams available. The stage III cam has a noticeable cam sound that so many are looking for. It will make even more average torque than the stage II cam, at the sacrifice of some low end torque and fuel mileage. This cam will work with the stock converter in some trucks, but it is recommended to install a 2800-3000 RPM stall converter for best overall performance. All of this is done in the Land Of The Free, made right here in the USA!