COMP Cams CBVI 299Th R7 Thumper Camshaft for Chevy 454/502 Big Block Engines

Designed to deliver an aggressive, hard-hitting exhaust note at idle, the Thumpr camshaft series from COMP Cams also delivers excellent horsepower gains and a broad torque curve. A perfect choice for muscle cars and street rods, the Thumpr series' early intake valve opening and long exhaust duration create optimum overlap for that race car idle. The Thumpr grinds all require an aftermarket torque converter and lower gear ratio to ensure the drivetrain always puts the engine in its powerband. Additionally, Thumpr camshafts typically deliver reduced vacuum at idle, making a vacuum canister, pump or hydroboost a requirement for vehicles running power brakes. Street/strip, needs 9.5:1 compression, 2800+ stall, intake, gears and headers, very rough idle. 1996-1999 Chevrolet 454/502 GEN VI Big Block

The COMP Cams CBVI 299Th R7 Thumper camshaft is engineered to deliver a bold, aggressive exhaust note at idle, making it a popular choice for muscle cars and street rods seeking a distinctive sound. Designed specifically for 1996-1999 Chevrolet 454 and 502 Gen V and VI Big Block engines, this camshaft features early intake valve opening and extended exhaust duration, optimizing overlap for a race-inspired idle and enhanced performance. Its design facilitates substantial horsepower gains and a broad torque curve, ideal for street/strip applications with a compression ratio of 9.5:1 or higher, and setups with 2800+ stall converters, headers, and gears. The Thumpr series' unique grind requires an aftermarket torque converter and a lower gear ratio to ensure the engine stays within its powerband during aggressive driving. Due to its reduced vacuum at idle, a vacuum canister, pump, or hydroboost is necessary when running power brakes, ensuring reliable brake function for street use. This camshaft is not carburetor approved and requires carb acknowledgment, emphasizing its suitability for custom setups and performance builds. Whether upgrading a muscle car or street rod, the COMP Cams Thumpr series provides a commanding sound profile and solid performance gains, making it a preferred choice for enthusiasts looking to maximize their engine's potential.

Features:

• Aggressive, race-inspired exhaust note at idle

• Early intake valve opening and long exhaust duration for optimal overlap

• Designed for 1996-1999 Chevrolet 454/502 Big Block engines

• Ideal for street/strip applications with high stall converters

• Requires aftermarket torque converter and lower gear ratio for best performance

• Reduced vacuum at idle necessitates vacuum canister or hydroboost for power brakes

• Enhances horsepower and broadens torque curve

Fits
Chevrolet C2500 Base 1996
Chevrolet C2500 Base 1997
Chevrolet C2500 Base 1999
Chevrolet C2500 Base 2000
Chevrolet C2500 Cheyenne 1996
Chevrolet C2500 Cheyenne 1997
Chevrolet C2500 Cheyenne 1998
Chevrolet C2500 LS 1999
Chevrolet C2500 LS 2000
Chevrolet C2500 Silverado 1996
Chevrolet C2500 Silverado 1997
Chevrolet C2500 Silverado 1998
Chevrolet C2500 WT 1998
Chevrolet C2500 Suburban Base 1996
Chevrolet C2500 Suburban Base 1997
Chevrolet C2500 Suburban Base 1998
Chevrolet C2500 Suburban Base 1999
Chevrolet C2500 Suburban LS 1996
Chevrolet C2500 Suburban LS 1997
Chevrolet C2500 Suburban LS 1998
Chevrolet C2500 Suburban LS 1999
Chevrolet C2500 Suburban LT 1996
Chevrolet C2500 Suburban LT 1997
Chevrolet C3500 Base 1996
Chevrolet C3500 Base 1997
Chevrolet C3500 Base 1999
Chevrolet C3500 Base 2000
Chevrolet C3500 Cheyenne 1996
Chevrolet C3500 Cheyenne 1997
Chevrolet C3500 Cheyenne 1998
Chevrolet C3500 LS 1999
Chevrolet C3500 LS 2000
Chevrolet C3500 Silverado 1996
Chevrolet C3500 Silverado 1997
Chevrolet C3500 Silverado 1998
Chevrolet Express 3500 Base 1996
Chevrolet Express 3500 Base 1997
Chevrolet Express 3500 Base 1998
Chevrolet Express 3500 Base 1999
Chevrolet Express 3500 Base 2000
Chevrolet Express 3500 LS 1996
Chevrolet Express 3500 LS 1997
Chevrolet Express 3500 LS 1998
Chevrolet Express 3500 LS 1999
Chevrolet Express 3500 LS 2000
Chevrolet G30 Beauville 1996
Chevrolet G30 Chevy Van 1996
Chevrolet G30 Hi-Cube 1996
Chevrolet G30 Sportvan 1996
Chevrolet K2500 Base 1996
Chevrolet K2500 Base 1997
Chevrolet K2500 Base 1999
Chevrolet K2500 Base 2000
Chevrolet K2500 Cheyenne 1996
Chevrolet K2500 Cheyenne 1997
Chevrolet K2500 Cheyenne 1998
Chevrolet K2500 LS 1999
Chevrolet K2500 LS 2000
Chevrolet K2500 Silverado 1996
Chevrolet K2500 Silverado 1997
Chevrolet K2500 Silverado 1998
Chevrolet K2500 WT 1998
Chevrolet K2500 Suburban Base 1996
Chevrolet K2500 Suburban Base 1997
Chevrolet K2500 Suburban Base 1998
Chevrolet K2500 Suburban Base 1999
Chevrolet K2500 Suburban LS 1996
Chevrolet K2500 Suburban LS 1997
Chevrolet K2500 Suburban LS 1998
Chevrolet K2500 Suburban LS 1999
Chevrolet K2500 Suburban LT 1996
Chevrolet K2500 Suburban LT 1997
Chevrolet K3500 Base 1996
Chevrolet K3500 Base 1997
Chevrolet K3500 Base 1999
Chevrolet K3500 Base 2000
Chevrolet K3500 Cheyenne 1996
Chevrolet K3500 Cheyenne 1997
Chevrolet K3500 Cheyenne 1998
Chevrolet K3500 LS 1999
Chevrolet K3500 LS 2000
Chevrolet K3500 Silverado 1996
Chevrolet K3500 Silverado 1997
Chevrolet K3500 Silverado 1998
Chevrolet P30 Base 1996
Chevrolet P30 Base 1997
Chevrolet P30 Base 1998
Chevrolet P30 Base 1999
GMC C2500 Sierra SL 1996
GMC C2500 Sierra SL 1997
GMC C2500 Sierra SL 1998
GMC C2500 Sierra SL 1999
GMC C2500 Sierra SL 2000
GMC C2500 Sierra SLE 1996
GMC C2500 Sierra SLE 1997
GMC C2500 Sierra SLE 1998
GMC C2500 Sierra SLE 1999
GMC C2500 Sierra SLE 2000
GMC C2500 Sierra SLT 1996
GMC C2500 Sierra SLT 1997
GMC C2500 Sierra SLT 1998
GMC C2500 Sierra SLT 1999
GMC C2500 Sierra SLT 2000
GMC C2500 Suburban Base 1996
GMC C2500 Suburban Base 1997
GMC C2500 Suburban Base 1998
GMC C2500 Suburban Base 1999
GMC C2500 Suburban SLE 1996
GMC C2500 Suburban SLE 1997
GMC C2500 Suburban SLE 1998
GMC C2500 Suburban SLE 1999
GMC C2500 Suburban SLT 1996
GMC C2500 Suburban SLT 1997
GMC C2500 Suburban SLT 1998
GMC C2500 Suburban SLT 1999
GMC C3500 Sierra SL 1996
GMC C3500 Sierra SL 1997
GMC C3500 Sierra SL 1998
GMC C3500 Sierra SL 1999
GMC C3500 Sierra SL 2000
GMC C3500 Sierra SLE 1996
GMC C3500 Sierra SLE 1997
GMC C3500 Sierra SLE 1998
GMC C3500 Sierra SLE 1999
GMC C3500 Sierra SLE 2000
GMC C3500 Sierra SLT 1996
GMC C3500 Sierra SLT 1997
GMC C3500 Sierra SLT 1998
GMC C3500 Sierra SLT 1999
GMC C3500 Sierra SLT 2000
GMC G3500 Magnavan 1996
GMC G3500 Rally 1996
GMC G3500 Rally Camper Special 1996
GMC G3500 Rally STX 1996
GMC G3500 Vandura 1996
GMC G3500 Vandura Special 1996
GMC K2500 Sierra SL 1996
GMC K2500 Sierra SL 1997
GMC K2500 Sierra SL 1998
GMC K2500 Sierra SL 1999
GMC K2500 Sierra SL 2000
GMC K2500 Sierra SLE 1996
GMC K2500 Sierra SLE 1997
GMC K2500 Sierra SLE 1998
GMC K2500 Sierra SLE 1999
GMC K2500 Sierra SLE 2000
GMC K2500 Sierra SLT 1996
GMC K2500 Sierra SLT 1997
GMC K2500 Sierra SLT 1998
GMC K2500 Sierra SLT 1999
GMC K2500 Sierra SLT 2000
GMC K2500 Suburban Base 1996
GMC K2500 Suburban Base 1997
GMC K2500 Suburban Base 1998
GMC K2500 Suburban Base 1999
GMC K2500 Suburban SLE 1996
GMC K2500 Suburban SLE 1997
GMC K2500 Suburban SLE 1998
GMC K2500 Suburban SLE 1999
GMC K2500 Suburban SLT 1996
GMC K2500 Suburban SLT 1997
GMC K2500 Suburban SLT 1998
GMC K2500 Suburban SLT 1999
GMC K3500 Sierra SL 1996
GMC K3500 Sierra SL 1997
GMC K3500 Sierra SL 1998
GMC K3500 Sierra SL 1999
GMC K3500 Sierra SL 2000
GMC K3500 Sierra SLE 1996
GMC K3500 Sierra SLE 1997
GMC K3500 Sierra SLE 1998
GMC K3500 Sierra SLE 1999
GMC K3500 Sierra SLE 2000
GMC K3500 Sierra SLT 1996
GMC K3500 Sierra SLT 1997
GMC K3500 Sierra SLT 1998
GMC K3500 Sierra SLT 1999
GMC K3500 Sierra SLT 2000
GMC P3500 Base 1996
GMC P3500 Base 1997
GMC P3500 Base 1998
GMC P3500 Base 1999
GMC Savana 3500 Base 1996
GMC Savana 3500 Base 1997
GMC Savana 3500 Base 1998
GMC Savana 3500 Base 1999
GMC Savana 3500 Base 2000
GMC Savana 3500 SLE 1996
GMC Savana 3500 SLE 1997
GMC Savana 3500 SLE 1998
GMC Savana 3500 SLE 1999
GMC Savana 3500 SLE 2000