Brian Tooley Racing BTR Stage 4 LS Truck Cam Install Kit with GM 12499225 Lifters, Beehive Springs, Hardened Pushrods, Gaskets, for Chevy LS 4.8 5.3 – +72HP +24TQ – Very Aggressive Idle

Description

Unleash high‑rpm authority with the BTR Stage 4 LS Truck cam. With 219/23x advertised duration, .553/.553″ lift and a 108.5° LSA, this aggressive grind moves power into the upper midrange and top end across a 2200–6700 RPM band—dyno‑proven at ~+72 HP / +24 lb‑ft and extending peak revs by ~+1000 RPM on properly built engines.

On the road and track expect razor‑sharp throttle response, a violent mid/top shove beginning around 2500 RPM and sustained pull to 6700 RPM. Idle is pronounced and choppy (8/10 on the chop scale) and the exhaust is loud and raspy under load—this cam is aimed at drivers who want track‑capable performance and high‑rev character.

This complete kit pairs the Stage 4 cam with GM Performance roller lifters (12499225), 16 Redline .625″ beehive springs with steel retainers, 16 hardened 7.400″ pushrods (.080″ wall), a full upper MLS head gasket set, and two sets of USA head bolts for proper sealing and valvetrain control.

• 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 RESULTS: Measured gains of ~+72 HP and +24 lb‑ft with a roughly +1000 RPM extension on instrumented dyno runs — stronger peak power and a raised rev ceiling delivering faster acceleration, higher top‑end power, and a noticeably more aggressive power curve across the 2200–6700 RPM band.
• DRIVE CHARACTER: Razor‑sharp throttle response, violent mid/top shove beginning ~2500 RPM, smooth ramp to 6700 RPM; pronounced 8/10 on the Chop Scale and a loud, raspy exhaust note under load—track‑oriented feel.
• HIGH-PERFORMANCE PAC1219 BEEHIVE SPRINGS: Max Lift: .625″ | Spring Rate: 340 lbs/in | Coil Bind: 1.100″ | Installed Height: 1.800″ @ 135 lbs | Open Load: 348 lbs @ 1.175″. – WITH STEEL RETAINERS.
• 7.400″ HARDENED PUSH RODS – With 0.80″ Wall Thickness. Built with a robust design for precise valve actuation and maximum strength, promoting optimal engine function under high-performance conditions.