COMP Cams 54-271-11 HV NSR Cam 218/226 .541/.541 Hyd Roller for GEN III/IV 4.8L/5.3L/6.0L

Drop in performance with stock valve springs using COMP Cams part number 54-271-11, an HV NSR hydraulic roller camshaft engineered for GM 4.8L, 5.3L and 6.0L cathedral port engines. Fits 65 Avanti, Buick, Cadillac, Chevrolet and 5 other makes vehicles from 1999 to 2020, including the 2003-2005 and 2010-2020 Chevrolet Express 2500 and GMC Savana 2500 and the 2010-2020 Chevrolet Express 3500 and GMC Savana 3500. Full vehicle list below. The NSR profile delivers +69 horsepower at peak while increasing torque across the entire operating range, with 0.541-inch valve lift on both intake and exhaust sides. Designed for street use with minimal tuning, this cam provides a deep rumble with a mild lope and remains compatible with stock converters.

• Camshaft Type: Hydraulic roller
• Series: HV NSR
• Grind Profile: LS272PU-12
• Engine Application: GM 4.8L, 5.3L, 6.0L cathedral port
• Engine Platform: GM LS GEN III/IV
• Usage: Street
• Lifter Type: Roller
• Intake Valve Lift: 0.541 IN
• Exhaust Valve Lift: 0.541 IN
• Intake Valve Lift at.050 Inch: 0.541 IN
• Exhaust Valve Lift at.050 Inch: 0.541 IN
• Advertised Intake Duration: 272 deg
• Advertised Exhaust Duration: 278 deg
• Intake Duration at.050 Inch Lift: 218 deg
• Exhaust Duration at.050 Inch Lift: 226 deg
• Lobe Separation: 112 deg
• Camshaft Intake Centerline: 107
• Advance: 5 deg
• Intake Lobe Lift: 0.318
• Exhaust Lobe Lift: 0.318
• Intake Open BTDC: 2 degrees
• Exhaust Open BBDC: 36 degrees
• Exhaust Close ATDC: -4 degrees
• Intake Close ABDC: 50 degrees
• Factory Rocker Ratio: 1.7
• Valve Lash: Hydraulic (both intake and exhaust)
• Operating RPM Range: 2500-6200
• Performance: 69 horsepower at peak
• Valve Springs Required: Yes (but compatible with stock)
• VVT Compatible: No
• Direct Injection: No
• Computer Controlled Compatible: Yes
• Fuel Management Strategy Compatible: No
• Stock Converter Compatible: Yes
• Intake Valve Lash: Hyd
• Exhaust Valve Lash: Hyd