INTRODUCING: TRUCK NORRIS. The Brian Tooley R&D team has been hunkered down for months, buried in their work, and driven to provide a camshaft worthy of the name TRUCK NORRIS. After countless designs, grinds, Spintron sessions, Superflow engine dyno tests, we are proud to introduce the newest addition to our Gen 3/4 LS Truck Cam lineup. Brian Tooley Racing Notes: OEM stall torque converters have shown no issues in testing. Designed for use in 99+ Gen 3/4 LS Trucks 5.3/6.0 Completely designed in house. Idle note is similar to our more aggressive truck grinds. For use with Truck Cam Kit install parts. (Beehive/LS6 springs & OEM pushrods) More power. More Torque. Less Compromise. This camshaft shines across the board and delivers the end user an experience that truly embodies the namesake. This cam has also been friendly with OEM torque converters in testing. Fits 1999+ GM Trucks (Silverado, Sierra, Tahoe, Yukon, Escalade, etc) with 4.8, 5.3, and 6.0 engines. Does not work with direct injection equipped trucks (2015+)