Thumpr NSR Stage 1 Hydraulic Roller Camshaft

The COMP Cams Thumpr NSR camshaft is a Stage 1 hydraulic roller camshaft engineered for GM LS GEN III/IV 3-Bolt 8 Cylinder engines manufactured between 1997 and 2015. Constructed from durable billet steel, this camshaft features a 3-bolt gear attachment and is designed for optimal performance in street and performance applications. The Thumpr NSR (No Springs Required) series offers enhanced performance without the need for additional spring upgrades, making installation more straightforward. This camshaft boasts an intake valve lift of 0.614 inches and an exhaust valve lift of 0.606 inches, with intake duration at 0.050 inch lift at 218 degrees and exhaust duration at 0.050 inch lift at 229 degrees. The lobe separation is set at 111 degrees. It is designed to operate effectively within a basic RPM range of 1,500 to 6,300 RPM. Compatible with a wide range of GM LS-based truck engines, including 4.8L, 5.3L, and 6.0L displacements. Specific vehicle applications include Chevrolet Silverado, GMC Sierra, Chevrolet Tahoe, GMC Yukon, Chevrolet Suburban, Hummer H2, and Saab 9-7x models within the specified engine family years. For those seeking a complete solution, COMP Cams offers CK and MK camshaft kits, which can be identified by adding CK or MK to the part number, ensuring all necessary valvetrain components are properly matched.