Brian Tooley Racing Norris NSR Performance Camshaft for Trucks

Description

The BTR Truck Norris NSR Camshaft is a No Springs Required (NSR) version of the legendary Truck Norris camshaft. Designed for Gen III and Gen IV LS truck engines, this camshaft offers impressive performance gains while allowing the use of factory valve springs, provided they are in good condition.

Developed through extensive in-house cam lobe design and dyno testing, the Truck Norris NSR camshaft delivers increased power and torque across the entire RPM range compared to previous BTR truck cams. It’s an ideal choice for enthusiasts seeking a performance upgrade without the need for additional valvetrain modifications.

Specifications

• Intake Duration (@ .050″): 212°

• Exhaust Duration (@ .050″): 22X°

• Valve Lift (Intake/Exhaust): .498″/.498″

• Lobe Separation Angle (LSA): 107°

• Camshaft Type: Hydraulic Roller

• Operating Range: 4000–7000 RPM

• Gear Attachment: 3-Bolt

Engine Compatibility

Compatible with the following GM LS-based engines:

• 4.8L

• 5.3L

• 5.7L

• 6.0L

• 6.2L

Fits Gen III and Gen IV LS truck engines, including models like the Silverado, Sierra, and other GM trucks from 1999 to 2013.

Installation Notes

• Valve Springs: While this camshaft is designed to work with factory valve springs, it’s crucial to ensure they are in good condition and provide adequate spring pressure. If there’s any doubt about the condition of your existing springs, it’s recommended to replace them to prevent potential engine damage.

• Tuning: Custom engine tuning is necessary to achieve optimal performance and drivability.

• Cam Gear: For Gen IV engines with a single-bolt cam gear, conversion to a 3-bolt cam gear is required.

Why Choose the Truck Norris NSR Camshaft?

• Delivers impressive performance gains without the need for valve spring upgrades

• Retains the aggressive “choppy” idle characteristic of the original Truck Norris cam

• Ideal for enthusiasts seeking a cost-effective performance upgrade

• Developed through extensive testing to ensure reliability and performance

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