Brian Tooley Racing BTR Stage 4 LS Truck Cam Install Kit with GM 12499225 Lifters, Bolts, Gaskets, for Chevy LS 4.8 5.3 1999-2013 Vortec – +72HP +24TQ – Very Aggressive Idle – MADE IN THE USA

Description

Unleash serious high‑rpm power with the BTR Stage 4 LS Truck cam. With a 219/23x advertised duration, .553/.553″ lift and a 108.5° LSA, this aggressive grind moves power into the upper midrange and top end while preserving a usable band from 2200–6700 RPM. Dyno results show ~+72 HP and +24 lb‑ft with a roughly +1000 RPM extension—real gains when matched with supporting hardware and tuning.

This cam delivers an aggressive, choppy idle (8/10 on the chop scale) and a loud, authoritative exhaust note under load. Expect immediate throttle snap, strong mid/top pull, and sustained power to the rev limit; it’s a performance cam for drivers who want high RPM authority and track-capable results while still using robust valvetrain components.

The kit includes GM Performance roller lifters (12499225), a full upper head gasket set with MLS head gaskets, and two sets of USA‑made head bolts for consistent clamp load and reliable sealing. All core components are sourced/made in the USA where specified—designed as a matched, install‑ready solution for serious LS truck and high‑rev builds.

• 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.
• CAM SPECS: BTR Stage 4 LS Truck — 219/23x advertised duration, .553/.553″ lift, 108.5° LSA; engineered for high‑rpm power and aggressive mid/top performance.
• DYNO‑PROVEN: Tested at ~+72 HP and +24 lb‑ft with ~+1000 RPM gain on a dynoed build—results depend on supporting parts and tuning.
• AGGRESSIVE IDLE: 8/10 on the chop scale — pronounced, choppy idle and a loud, performance‑oriented exhaust tone under load.
• DRIVE CHARACTER: Immediate, razor‑sharp throttle response with a violent mid/top‑end shove – thick acceleration from ~2500 RPM, smooth ramp to 6700 RPM; pronounced, choppy 8/10 idle and a loud, raspy exhaust note under load – track‑focused feel that demands proper supporting valvetrain and tuning for controllable street use.