NMN Precision NON MDS Lifters Set 53021720AA 53021720AB Replacement for 2003-2018 Chrysler 300 Dodge Ram 1500 Charger Challenger Grand Cherokee 5.7L 6.1L 6.4L HEMI Replace# 5038784AD 5038686AA
- ...9-2013 Silverado and Sierra (4.8L, 5.3L, 6.0L). Fits for LS1, LS2, LS3, LS6, LS7, LS9 LSX Engines (4.8L, 5.3L, 5.7L, 6.0L, 6.2L).
- Hydraulic tappet Replaces OEM #: 12595365 12499225 12551162 12569259.
- Hydraulic tappet, also called valve lifter or hydraulic lash adjuster, is a device for maintaining zero valve clearance in an internal combustion engine. It helps get rid of the need for combustion engine to have mechanical clearance in the engine's valve train, to keep the valve from being held open and thus destroyed as the valve train goes through its process of thermal expansion. In effect, valve lifter keeps the valve healthy and protects from an engine's normal thermal expansion process.
- A guide and anti-rotation device for the valve lifter comprises a vertically-disposed leg which seats in a slot formed on the valve lifter and a pair of cylindrically shaped arms, extending horizontally from opposite edges of the leg, which seat in a circumferential groove also formed on the valve lifter. A hook, connected to an upper end of the leg by a reverse bend, seats in a bore formed in the cylinder block.
- Quality materials used, meets or exceeds OEM standards, 100% tested before shipping..