Brian Tooley Racing BTR Truck Norris Camshaft Install Rebuild Kit with GM 12499225 Performance Lifters, Bolts, Gaskets, for Chevy LS 4.8 5.3 1999-2013 Vortec – +57HP +16TQ – MADE IN THE USA

Description

Turn your truck into a torque monster with the BTR Truck Norris cam. With .552/.552″ lift and a 212/22x duration on a 107° LSA, this grind shifts power into a thick, useable midrange and delivers a pronounced, authoritative exhaust note while remaining street‑friendly across a broad 1800–6600 RPM band. Dyno‑proven gains (~+57 HP / +16 lb‑ft on a 5.3L) show tangible performance improvements for towing, passing, and daily driving.

The Truck Norris is engineered to add immediate throttle response and stronger roll‑on acceleration where you feel it most. Expect a beefy low/mid torque hit off the line, smooth transition through the midband, and strong top‑end support for highway passing. Idle will have a noticeable, truck‑friendly lope and a deeper exhaust character under load.

This complete kit includes GM Performance lifters (12499225) matched for correct valvetrain contact, a full upper head gasket set with MLS head gaskets for durable sealing, and two sets of USA‑made Elgin or Fel‑Pro head bolts to maintain consistent clamp load. It’s a matched, ready‑to‑install package for Gen‑III/Gen‑IV truck builds seeking reliable, torquey performance.

• This is a premium kit that is MADE IN THE USA. Every component in this kit is proudly manufactured in the USA, ensuring the highest quality and reliability on the market. Unlike cheaper import kits that risk premature failure, this kit delivers lasting performance while supporting American manufacturing and helping bring jobs back to America.
• The Truck Norris will deliver a roundhouse kick in the pants to your 1999-2013 GM V8 Truck or SUV! Developed from hundreds of hours of in-house cam lobe design and dyno testing, this camshaft has more power and torque everywhere in the curve compared to BTR’s legendary V2 truck cams. It has an idle sound similar to more aggressive truck camshafts, yet will behave well with stock torque converters.
• CAM SPECS: BTR Truck Norris — .552/.552″ lift, 212/22x duration, 107° LSA; tuned for heavy low/mid torque and strong drivability.
• DYNO PROVEN: ~+57 HP and +16 lb‑ft torque on a 5.3L (dyno) — real-world gains depend on supporting hardware and tune.
• LOW/MID TORQUE FOCUS: Thick, immediate midrange shove for towing, hauling, and confident roll‑on acceleration.