Street/strip, needs 9.5:1 compression, 2800+ stall, intake, gears and headers, very rough idle.
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.
Application Summary:
| Year |
Make/Model |
| 1996-2000 |
Chevrolet C2500 |
| 1996-1999 |
Chevrolet C2500 Suburban |
| 1996-2000 |
Chevrolet C3500 |
| 1996-2000 |
Chevrolet Express 3500 |
| 1996 |
Chevrolet G30 |
| 1996-2000 |
Chevrolet K2500 |
| 1996-1999 |
Chevrolet K2500 Suburban |
| 1996-2000 |
Chevrolet K3500 |
| 1996-1999 |
Chevrolet P30 |
| 1996-2000 |
GMC C2500 |
| 1996-1999 |
GMC C2500 Suburban |
| 1996-2000 |
GMC C3500 |
| 1996 |
GMC G3500 |
| 1996-2000 |
GMC K2500 |
| 1996-1999 |
GMC K2500 Suburban |
| 1996-2000 |
GMC K3500 |
| 1996-1999 |
GMC P3500 |
| 1996-2000 |
GMC Savana 3500 |
| Attributes |
| Advertised Exhaust Duration |
319, 319 |
| Advertised Intake Duration |
299, 299 |
| Amazon ASIN |
B005H89P7O |
| ASIN |
B005H89P7O |
| Assembly Lubricant Included |
No, No |
| Basic Operating RPM Range |
2,500-6,200, 2,500-6,200 |
| C.A.R.B. E.O. Number |
N/A |
| C.A.R.B. Exempt for Foreign Vehicles Manufactured Before 1967? |
Yes, but must meet tailpipe emission standards for year of vehicle. |
| C.A.R.B. Exempt for On-Road Vehicles? |
No |
| C.A.R.B. Exempt for Racing and Off-Road Only Vehicles? |
Yes, but must be a race/competition only vehicle. |
| C.A.R.B. Exemption Reason |
N/A |
| California Proposition 65 |
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov |
| Cam and Lifter Kit Upgrade |
CL01-602-8, CL01-602-8 |
| Cam Type |
Hydraulic Roller, Hydraulic Roller |
| Camshaft Gear Attachment |
3-Bolt, 3-Bolt |
| Camshaft Material |
Austempered Ductile Iron, Austempered Ductile Iron |
| Camshaft Series |
Thumpr, Thumpr |
| Country of Origin (Primary) |
US |
| Emission Code |
Not in CA |
| Engine Family |
Chevrolet GEN VI 454 and 502 c.i. 8 Cylinder (1996-1999), Chevrolet GEN VI 454 and 502 c.i. 8 Cylinder (1996-1999) |
| Engine Make/Size |
Chevy Gen VI 454 |
| Exh. Duration @ .050 in. (Deg) |
257 |
| Exh. Duration Advertised (Deg) |
319 |
| Exhaust Duration at .050 inch Lift |
257, 257 |
| Exhaust Valve Lift |
0.554, 0.554 |
| Exhaust Valve Lift (in.) |
0.554 |
| Grind Number |
299THR7, 299THR7 |
| Harmonized Tariff Code (Schedule B) |
8409914000 |
| Hazardous Material Code |
N |
| Int. Duration @ .050 in. (Deg) |
243 |
| Int. Duration Advertised (Deg) |
299 |
| Intake Duration at .050 Inch Lift |
243, 243 |
| Intake Valve Lift |
0.569, 0.569 |
| Intake Valve Lift (in.) |
0.569 |
| K-Kit Upgrade |
K01-602-8, K01-602-8 |
| Life Cycle Status Code |
Available to Order |
| Lifter Style |
Hydraulic Roller |
| Lifter Type |
Hydraulic Roller, Hydraulic Roller |
| Lifters Included |
No, No |
| Lobe Separation |
107, 107 |
| NAFTA Preference Criterion Code |
B |
| RPM Range |
2500-6200 |
| SDR Required Flag |
N |
| SDS Sheet Number |
N/A |
| Usage |
Street/Strip, Street/Strip |
| Valve Springs Required |
Yes, Yes |
| Warranty Time |
12 |
| GTIN |
00036584211952 |
