Chevy 348/409 Thumpr Hyd Cam - 279HT107

The Chevy 348/409 Thumpr Hyd Cam from COMP CAMS is a precision hydraulic flat tappet camshaft engineered for classic Chevrolet W-Series big-block engines. Designed for enthusiasts and rebuilders seeking reliable valve train control across a broad RPM range, this cam delivers predictable lift and duration characteristics essential for street and mild performance applications. The hydraulic design automatically adjusts to engine load and temperature, eliminating the complexity of solid lifter adjustments while maintaining durability and ease of installation.

Specifications define this cam's real-world performance envelope: 0.512-inch intake lift paired with 0.498-inch exhaust lift, 278-degree intake duration and 296-degree exhaust duration, and a 107-degree lobe separation angle (LSA) that favors mid-range torque delivery. The operational RPM range spans 1500 to 5000, making it ideal for stock-based rebuilds and mild street engines where low-end responsiveness and part compatibility matter. Hydraulic flat tappet design distributes loads evenly across the lifter face, reducing wear on lobe and tappet while the self-adjusting mechanism compensates for normal oil clearance variance—critical for long-term reliability in vintage powerplants.

This camshaft suits owners rebuilding 348 or 409 cubic-inch W-Series engines who prioritize bolt-in compatibility and straightforward installation without specialized tooling. The asymmetrical lobe profile—longer exhaust duration—improves scavenging at part-throttle operation, enhancing throttle response and driveability on street machines. Installation requires standard camshaft timing procedures and compatible hydraulic lifters; confirming valve train clearance and proper oil delivery to lifter bores ensures peak performance and longevity in your classic Chevrolet big-block application.