Brian Tooley Racing BTR Truck Norris NSR Camshaft – GM Gen III/IV LS Truck (BTR-TRUCKNORRIS-NSR)
The BTR Truck Norris NSR Camshaft is engineered for enthusiasts looking to maximize performance without the need for upgraded valve springs. Designed specifically for Gen III and Gen IV LS-based truck engines, this cam delivers a noticeable increase in horsepower and torque across the entire RPM range while maintaining excellent drivability.
Building on the proven success of the original Truck Norris platform, this NSR variant benefits from extensive in-house camshaft development, including advanced lobe design and comprehensive dyno testing. The result is improved midrange punch and stronger top-end performance compared to previous V2 truck cam profiles—all while remaining compatible with factory valve springs.
Camshaft Specifications:
- Duration: 212°/22X°
- Lift: .500” / .500”
- Lobe Separation Angle: 107°
- NSR (No Springs Required) design
Key Features:
- Increased horsepower and torque throughout the powerband
- Optimized for stock valvetrain compatibility (no spring upgrade required)
- Enhanced throttle response and midrange acceleration
- Proven BTR lobe design for reliability and performance
Vehicle Fitment:
- 1999–2013 GM Silverado / Sierra
- 4.8L, 5.3L, and 6.0L Gen III/IV LS engines
Important Notes:
-
Not compatible with direct injection (DI) engines (2015+ models)
-
Designed for cathedral port LS truck applications
