SBC Thumpr Series Hyd. Roller Cam 291THR7

The COMP Cams SBC Thumpr Series Hydraulic Roller Cam 291THR7 is a street-performance camshaft engineered for small block Chevy engines seeking aggressive valve timing with the reliability of hydraulic roller technology. This cam delivers 0.522-inch intake lift and 0.509-inch exhaust lift across a 291-degree intake and 311-degree exhaust duration, with a 107-degree lobe separation angle optimized for low-end torque and mid-range power delivery between 2200 and 5900 RPM.

Hydraulic roller cam design eliminates the complexity and maintenance demands of solid roller conversions while maintaining the low-friction advantages of roller contact at the lifter. The 291-degree intake duration and moderate lift specs make this camshaft suitable for naturally aspirated small block applications where street manners, fuel economy, and valve train durability remain priorities alongside noticeable performance gain. The asymmetrical lobe profile—with longer exhaust duration—supports scavenging efficiency in carbureted or fuel-injected platforms without requiring extensive cylinder head porting or high-octane fuel dependency.

This camshaft targets hot street builders, weekend racers, and restomod enthusiasts running small block Chevy platforms in street rods, trucks, and muscle cars. The 2200 RPM idle point keeps rpm within practical street-driving range, while 5900 RPM peak power allows full utilization in higher-revving builds. Thumpr Series cams are recognized for their aggressive mechanical noise signature—a feature valued by enthusiasts seeking authentic V-8 character without sacrificing hydraulic reliability. Installation requires standard small block Chevy cam-and-lifter compatibility; verify your engine's lifter type and valve train geometry before ordering.