A roller camshaft is a part of an engine that helps control the opening and closing of the engine's valves. It has small rolling wheels on it that reduce friction and improve the engine's performance and efficiency. Full definition
4 - Bolt Main Block (1 - Piece Seal) Nodular Iron Crankshaft Powdered Metal Connecting Rods Dished Hypereutectic Pistons Compression Ratio: 9.4 to 1 Hydraulic Roller Camshaft Lift:.414» Intake,.428» Exhaust Duration at.050»: 191 ° Intake, 196 ° Exhaust (chevroletperformanceparts.com)
The ZZ427 / 480 features our latest - generation block casting with four - bolt main caps, an all - forged rotating assembly, and a hydraulic roller camshaft instead of the original L88's flat - tappet cam, for greater drivability and a broader performance range. (chevrolet.com)
It also uses a smooth hydraulic roller camshaft for excellent drivability and a broad performance range. (chevrolet.com)