1996 Chevy Dually Truck - Cylinder Heads & Hydraulic Roller Cam - Head Games, Part 2 Photo Gallery
2.The roller lifters are longer than the stock units. A new pushrod length will need to be used to accommodate the new lifters. Stock lifters are set off center of the cam to make the lifter rotate in the lifter bore. This helps reduce lifter wear. The roller on the roller lifters ride on the cam but generate less friction heat.