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.
Catalog
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This Part Fits:

Year	Make	Model	Submodel
1970-1971	Dodge	Challenger	Base
1970-1971	Dodge	Challenger	R/T
1969-1971	Dodge	Charger	500
1966-1971	Dodge	Charger	Base
1969	Dodge	Charger	Daytona
1967-1971	Dodge	Charger	R/T
1969	Dodge	Charger	SE
1971	Dodge	Charger	Special Edition
1971	Dodge	Charger	Super Bee
1967-1970	Dodge	Coronet	440
1967-1970	Dodge	Coronet	500
1967,1970-1971	Dodge	Coronet	Base
1971	Dodge	Coronet	Brougham
1971	Dodge	Coronet	Crestwood
1971	Dodge	Coronet	Custom
1968-1970	Dodge	Coronet	Deluxe
1967-1970	Dodge	Coronet	R/T
1968-1970	Dodge	Coronet	Super Bee
1970-1971	Plymouth	Cuda	Base
1968-1971	Plymouth	GTX	Base
1968-1971	Plymouth	Road Runner	Base