Description

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.

Additional Attributes:

GTIN: 00036584266624
Assembly Lubricant Included: No
Camshaft Gear Attachment: 1-Bolt
Camshaft Material: Billet Steel
Engine Family: American Motors 290-401 c.i. 8 Cylinder (1966-1991)
California Proposition 65: WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov
Lifter Type: Hydraulic Roller
Amazon ASIN: N/A
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. Exempt for Federally Certified Vehicles Manufactured Before 1967?: Yes, but must meet tailpipe emission standards for year of vehicle.
C.A.R.B. Exempt for California Certified Vehicles Manufactured Before 1965?: Yes, but must meet tailpipe emission standards for year of vehicle.
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. E.O. Number: N/A
C.A.R.B. Exemption Reason: N/A
Camshaft Series: Thumpr
Usage: Street/Performance
Cam Type: Hydraulic Roller
Grind Number: 299THR7
Basic Operating RPM Range: 2,500-6,400
Intake Duration at .050 Inch Lift: 243
Exhaust Duration at .050 inch Lift: 257
Advertised Intake Duration: 299
Advertised Exhaust Duration: 319
Lobe Separation: 107
Intake Valve Lift: 0.552
Exhaust Valve Lift: 0.537
Lifters Included: No
Valve Springs Required: Yes

Packaging:

Quantity of Each: 1
Package UOM: EA

PDF:

dddbebdc29809

Fitment

Make	Model	Sub-model	Years
American Motors	Ambassador	BASE	1967, 1968, 1969, 1970, 1971, 1972
		Brougham	1973, 1974
	American	BASE	1966, 1967, 1968
	AMX	Base	1968, 1969, 1970, 1978, 1979
	Classic	BASE	1966
	Concord	BASE	1978, 1979
	Gremlin	BASE	1972, 1973, 1974, 1975, 1976
	Hornet	BASE	1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977
	Javelin	BASE	1968, 1969, 1970, 1971, 1972, 1973, 1974
	Marlin	Base	1967
	Matador	Base	1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978
	Pacer	BASE	1978, 1979
	Rambler	BASE	1969
	Rebel	BASE	1967, 1968, 1970
	Rogue	Base	1966
	Spirit	Base	1979
Bricklin	SV-1	Base	1974
International	100	BASE	1974
	200	BASE	1974
Jeep	Cherokee	BASE	1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983
	CJ5	BASE	1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981
	CJ6	Base	1971, 1972, 1973, 1974, 1975
	CJ7	BASE	1976, 1977, 1978, 1979, 1980, 1981
	Commando	Base	1972, 1973
	Grand Wagoneer	Base	1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991
	J-100	Base	1971, 1972, 1973
	J-2500	Base	1970, 1971, 1972, 1973
	J-2600	Base	1970, 1971, 1972, 1973
	J-3800	Base	1970, 1971
	J-4500	Base	1971, 1972, 1973
	J-4600	Base	1971, 1972, 1973
	J-4700	Base	1971, 1972, 1973
	J-4800	Base	1971, 1972, 1973
	J10	Base	1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988
	J20	Base	1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988
	Wagoneer	BASE	1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983

Additional information

Weight	10.75 lbs
Dimensions	24.5 × 3 × 2.75 in

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