Manufacturer's Part Number:
COMP Cams Thumpr NSR Modular 3V Camshafts
Summit Racing Part Number:
Hydraulic roller follower
Basic Operating RPM Range:
Intake Duration at 050 inch Lift:
Exhaust Duration at 050 inch Lift:
Duration at 050 inch Lift:
226 int./246 exh.
Advertised Intake Duration:
Advertised Exhaust Duration:
265 int./298 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
Exhaust Valve Lift with Factory Rocker Arm Ratio:
Valve Lift with Factory Rocker Arm Ratio:
0.450 int./0.450 exh.
Lobe Separation (degrees):
Valve Springs Required:
Sold as a pair.
Designed to fit SOHC modular 3V engines. Requires cam phaser upgrade and custom tuning.
Choose In-store pick-up (OH, GA, NV) on our web site.
These COMP Cams Thumpr NSR modular 3-valve camshafts for Ford 4.6L/5.4L engines deliver an aggressive "thumping" exhaust idle and generous power gains in the middle and upper rpm range. These cams will turn your Ford 3-valve engine into a performance machine with a minimum of installation difficulty; they only require the addition of the COMP Cams cam phaser limiter kit and computer tuning. The COMP Cams cam phaser limiter kit safely modifies the factory variable cam timing (VCT) system, allowing for the use of aggressive camshaft lobe technology without sacrificing the benefits of the VCT. Choose between three unique cam designs--Thumpr, Mutha' Thumpr, and Big Mutha' Thumpr--each deliver excellent horsepower gains and broad torque curves for your musclecar.