Mutha' Thumpr™ NSR 234/254 Hydraulic Roller Cams for Ford 4.6/5.4L Modular 3 Valve. Very rough idle, biggest cam for stock heads. Great power above 4900 RPM. Compatible with stock valve springs, benefits from converter & gears, requires cam phaser upgrade & custom tuning.
Requires aftermarket valve springs/retainers
Grind Number: MT273LL-9
Engine Family: Ford 4.6L and 5.4L SOHC Modular 3 Valve 8 Cylinder (2004+)
RPM Operating Range: 750-6,600
Cam Type: Hydraulic Roller Finger Follower
Lifter Style: Hydraulic Roller Finger Follower
Camshaft Series: Thumpr NSR (No Springs Required)
Camshaft Gear Attachment: 1-Bolt
Valve Springs Required: No
Camshaft Material: Billet Steel
California Proposition 65: WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov
Advertised Intake Duration: 273
Advertised Exhaust Duration: 306
Intake Duration at .050 Inch Lift:234
Exhaust Duration at .050 Inch Lift:254
Intake Valve Lift: 0.45
Exhaust Valve Lift: 0.45
Lobe Separation: 109
Assembly Lubricant Included: No
Intake Centerline: N/A
Lobe Lift Intake: N/A
Lobe Lift Exhaust: N/A
Common Usage:Mild street performance to mild race
Key Benefits:Modern, aggressive roller profiles, reduced friction, low maintenance, reduced valve train noise, more power than conventional hydraulic flat tappet camshafts
Limitations:Increased cost, limited rpm range
Frequently used in today’s OEM factory engines and mild to moderately aggressive performance engines, hydraulic roller cams use lifters equipped with a roller wheel that tracks along the camshaft lobe, reducing wear and friction, and enabling faster lobe ramp rates than flat tappet cams. These quiet operation lifters feature the same internal design as hydraulic flat tappet lifters with internal cavities and pistons but do not rotate within the lifter bore. Suited for typical street or moderate race engine speeds, the lifters are pre-loaded and do not require a lash setting. Most OEM hydraulic roller camshafts are limited to 6200 rpm and performance aftermarket systems to approximately 6800 rpm. Hydraulic roller lifters require an appropriately selected valve spring to maintain control and avoid lifter float at higher engine rpm. Hydraulic roller lifters can be re-used with multiple camshafts, however they are more costly than any form of flat tappet lifters.
For more than 35 years, the COMP Cams® mission has never changed: to produce the highest-performing products possible, provide customers with superior service, and to lead the industry in technological development. While the COMP Performance Group™ has grown to multiple companies and hundreds of employees, we still retain the competitive spirit and desire to be the very best that has positioned COMP Cams® as the absolute leader in valve train components.
COMP Cams® has never forgotten that performance is defined by results –both at the track and on the street. We spend thousands of hours working with individuals, teams and companies to ensure that our products provide superior performance and reliability. Whether we’re working with a Pro Stock or Sprint Cup team, or putting thousands of grueling miles on one of our pro touring or street/strip components, we test our products in the same places you do. That’s why we know that every COMP Cams® product will perform to the highest of standards.
Service Choosing a camshaft and valve train products isn’t like buying an oil filter. Everything in your valve train is part of a complex interlocking system that needs to perform well as a combination. That’s why we provide expert technical assistance to our customers –free of charge. Our staff of expert technical advisors, backed by a vast inventory of precision-manufactured valve train components -will help you to make sure that you have the right parts for your application
Technology COMP Cams® is driven by technology. We employ the industry's largest and most highly trained engineering staff, and the most sophisticated manufacturing processes and test equipment in the world. And because of our wide scope of applications, technologies developed for the highest levels of NASCAR and NHRA will find their way into our products for your street machine, too. The integration of research, engineering and development at COMP Cams® is what we call our “Systems Technology” and it consistently proves itself by out-performing the competition.