6.0L 6.4L HD Lifters

These lifters are made in the United States from superior forgings with a black oxide finish and a "C" clip retainer. With a reduced clearance between the lifter body and the precision ground internal piston, a slow leak down is allowed with very little loss of valve lift or duration at any RPM. These lifters will leak down between 90 to 120 seconds, whereas OEM lifters leak down between 10 to 120 seconds. This smaller leak down range helps create balance between all cylinders. Additionally, the tighter internal clearances cause the lifter to act as a heavy duty shock absorber holding up to higher spring pressure and higher lift camshafts.