Engine Kits

GM 5.3 AFM (Active Fuel Management) Lifter Replacement Kit AFM Lifter Replacement Kit
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GM 5.3 AFM (Active Fuel Management) Lifter Replacement Kit AFM Lifter Replacement Kit

Part #: GM5.3AFM
List Price: $923.88
Our Price: $499.99
You Save: $423.89

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2007 - 2014  Active Fuel management Engines Only 5.3L. 


  • Full set of Lifters (including AFM Lifters)
  • New lifter guides.
  • Valve Grind Gasket Set including MLS Head Gaskets
  • New Head Bolts

Read This Important Bulletin concerning this application

Please contact us if yours is not on this list.....  There are variations in Head Bolts and Gaskets

2007-2014 Avalanche, Silverado 1500, Sierra 1500 5.3 vin j , 0, 3, 7
2010-2012 Canyon, Colorado, H3  5.3


AFM lifters fail due to a faulty VLOM (valley cover) - Updated Deactivation Manifold is now available as part # 917-162  We have this priced to save you money.

Need Lifters only? Lifter kit also available as a separate purchase,   Part # GM5.3AFM-LK


917-162 - Cylinder Deactivation Manifold 5.3 6.0 6.2 Engines with Active Fuel ManagementDeactivation Manifold

GM5.3AFM-LK - Chevrolet 5.3 L Lifter Set for Active Fuel Management Engines

Gasket Components

Manufacturers have noticed an increase in the issues surrounding the replacement of deactivation lifters in GM LS engines with Active Fuel Management or AFM. After installing new lifters the original issue may not have been corrected. Most lifters returned for analysis are found to be good. We have found that most lifter faults are caused by oil pressure issues, or control issues. 

The AFM activation and deactivation is controlled by the Valve Lifter Oil Manifold or VLOM. The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve lifters. VLOM applies pressurized oil to the AFM lifters when cylinder deactivation is requested, and shuts off that supply of oil to reactivate those cylinders. Cylinder activation and deactivation are both supposed to occur on the base circle of the cam lobe, making the transition from four to eight cylinder mode unnoticeable to the driver. To control contamination a small replaceable oil filter is located in the VLOM inlet oil passageway. 

The AFM oil pressure relief valve regulates the oil supplied to the VLOM and is located in the oil pan near the oil filter housing. The AFM system has an operating range from 27 PSI to 66 PSI of oil pressure. At higher engine speeds the high side of this operating range is controlled by the AFM oil pressure relief valve. At low engine speeds the low side of the operating range will depend on the engines ability to produce oil pressure using the flow of oil from the oil pump. 

The AFM lifter bores in these engines have a spec of .843-.844, and the deactivation lifters require 22 PSI of pressure to release the locking pins. Taking these two things into consideration a lifter bore that is even slightly worn could bleed off enough oil pressure to prevent the lifter from unlocking. In addition it has been reported that it is common to find the VLOM oil filter plugged and needing replacement on high mileage engines with miss-fire fault codes. 

Manufacturers have received AFM DEAC lifters back for warranty claims where the lifter has been stuck compressed, this condition can be caused by the VLOM commanding activation or deactivation at the wrong point in the cam’s rotation, either in the ramp, or at the lobe peak. 

Any time an engine has failed AFM lifters the lifter guides must be replaced, the lifter bores must be measured, and the VLOM must also be tested for proper operation, or replaced. In addition the VLOM oil pressure switch filter must be replaced as well. 

Required Options:
Upgrade Options:
Fel Pro Gasket Upgrade:
Change to Fel Pro Gaskets $116.90
Add A New Camshaft:
Melling NEW Camshaft ML1394 (Special price with this kit only!) $199.99
Add Full Set of Push Rods:
New Set of Push Rods RP3349 (Special Low price when ordered with this kit) $10.72
Add a New Water Pump:
New ACL Water pump WP1106 (Special low price when ordered with this kit) $129.85
Add Oil Pump VIN 0 & 7 Only:
Add New Oil Pump M295 Melling $74.30
Add New Oil Pump VIN 3 & 7 Only:
Add Oil Pump VIN 3 & 7 M365 $115.31
Crank Bolt:
Add New TTY Crank Bolt 917-139 ( Must Have if removing front cover) $6.08
Harmonic Balancer Install Tool:
66519 Proform Harmonic Balancer Install Tool $54.24
Oil Pressure Sensor Filter:
Add Dorman Oil Pressure Sensor Filter 917-143 $6.16
Exhaust Manifold Bolts:
Exhaust Manifold Bolts 03413b $9.15
Add a set of Lifter Tray Bolts:
Add a set of 4 lifter tray bolts GM 12551163 $12.96
Cam Retaining Plate:
Cam Housing Gasket with Plate for LS engines Includes bolts 61220G $21.96
Hardware Finishing Kit:
Add Durabond Hardware Finishing Kit FKC7-4 Head Dowels, 8 Timing Cover Bolts, 4 Cam Sprocket Bolts, 4 Cam Thrust Plate Bolts, 1 Woodruff Key, 4 Seal Housing Bolts, 1 Oil Galley Plug, 1 Oil Gallley Plug (Front) $39.99

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