High performance street, stock converter ok, best with 2000+ converter and gears. Choppy/thumping 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 |
| 1968-1974 |
American Motors Ambassador |
| 1968 |
American Motors American |
| 1968-1970 |
American Motors AMX |
| 1978-1979 |
American Motors AMX |
| 1966 |
American Motors Classic |
| 1978-1979 |
American Motors Concord |
| 1972-1976 |
American Motors Gremlin |
| 1970-1977 |
American Motors Hornet |
| 1968-1974 |
American Motors Javelin |
| 1967 |
American Motors Marlin |
| 1971-1978 |
American Motors Matador |
| 1978-1979 |
American Motors Pacer |
| 1969 |
American Motors Rambler |
| 1968 |
American Motors Rebel |
| 1970 |
American Motors Rebel |
| 1966 |
American Motors Rogue |
| 1979 |
American Motors Spirit |
| 1974 |
Bricklin SV-1 |
| 1974 |
International 100 |
| 1974 |
International 200 |
| 1974-1983 |
Jeep Cherokee |
| 1971-1981 |
Jeep CJ5 |
| 1971-1975 |
Jeep CJ6 |
| 1976-1981 |
Jeep CJ7 |
| 1972-1973 |
Jeep Commando |
| 1984-1991 |
Jeep Grand Wagoneer |
| 1971-1973 |
Jeep J-100 |
| 1970-1973 |
Jeep J-2500 |
| 1970-1973 |
Jeep J-2600 |
| 1970-1971 |
Jeep J-3800 |
| 1971-1973 |
Jeep J-4500 |
| 1971-1973 |
Jeep J-4600 |
| 1971-1973 |
Jeep J-4700 |
| 1971-1973 |
Jeep J-4800 |
| 1974-1988 |
Jeep J10 |
| 1974-1988 |
Jeep J20 |
| 1972-1983 |
Jeep Wagoneer |
| Attributes |
| Advertised Exhaust Duration |
296, 296 |
| Advertised Intake Duration |
279, 279 |
| Amazon ASIN |
B0046ZL6MG |
| ASIN |
B0046ZL6MG |
| Assembly Lubricant Included |
Yes, Yes |
| Basic Operating RPM Range |
2,000-5,800, 2,000-5,800 |
| 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 |
CL10-600-5, CL10-600-5 |
| Cam Type |
Hydraulic Flat Tappet, Hydraulic Flat Tappet |
| Camshaft Gear Attachment |
1-Bolt, 1-Bolt |
| Camshaft Material |
Cast Iron, Cast Iron |
| Camshaft Series |
Thumpr, Thumpr |
| Country of Origin (Primary) |
US |
| Emission Code |
Not in CA |
| Engine Family |
American Motors 290-401 c.i. 8 Cylinder (1966-1991), American Motors 290-401 c.i. 8 Cylinder (1966-1991) |
| Engine Make/Size |
AMC 290-401 |
| Exh. Duration @ .050 in. (Deg) |
241 |
| Exh. Duration Advertised (Deg) |
296 |
| Exhaust Duration at .050 inch Lift |
241, 241 |
| Exhaust Valve Lift |
0.476, 0.476 |
| Exhaust Valve Lift (in.) |
0.476 |
| Grind Number |
279TH7, 279TH7 |
| Harmonized Tariff Code (Schedule B) |
8409914000 |
| Hazardous Material Code |
Y |
| Int. Duration @ .050 in. (Deg) |
227 |
| Int. Duration Advertised (Deg) |
279 |
| Intake Duration at .050 Inch Lift |
227, 227 |
| Intake Valve Lift |
0.491, 0.491 |
| Intake Valve Lift (in.) |
0.491 |
| K-Kit Upgrade |
K10-600-5, K10-600-5 |
| Life Cycle Status Code |
Available to Order |
| Lifter Style |
Hydraulic Flat Tappet |
| Lifter Type |
Hydraulic Flat Tappet, Hydraulic Flat Tappet |
| Lifters Included |
No, No |
| Lobe Separation |
107, 107 |
| NAFTA Preference Criterion Code |
B |
| RPM Range |
2000-5800 |
| SDR Required Flag |
Y |
| SDS Sheet Number |
COMP4-107 |
| Usage |
Street/Strip, Street/Strip |
| Valve Springs Required |
Yes, Yes |
| Warranty Time |
12 |
| GTIN |
00036584212744 |
