The exact part — skip the internet hunt.
AFM/DOD valve lifter set (8 collapsing AFM lifters) — the primary failure part
OEM # 12569256Also fits: ACDelco 12569256 (GM OE, single AFM lifter), GM 12595365 (lifter guide, paired), Delphi HL177 / HL178$22–$55
GM/ACDelco 12569256 is the genuine single AFM/DOD valve lifter (4.8/5.3/6.0/6.2, ~2005-2018 Gen IV). On a collapsed-lifter repair you replace all 8 AFM lifters (price is per lifter; a full 8-AFM + 8-standard + guide-tray kit runs ~$150-350). On Gen IV some apps use the newer DOD lifter 12698946. Aft
Lifter guides / guide trays (replace whenever lifters are pulled)
OEM # 12595365Also fits: ACDelco 12595365 (GM OE Gen III/IV lifter guide), included in most AFM-DOD lifter kits$8–$20
GM 12595365 is the genuine Gen III/IV lifter guide (per tray); 4 trays per engine. Mandatory replacement when servicing AFM lifters. Note: this is the GUIDE, NOT the AFM lifter itself.
VLOM — Valve Lifter Oil Manifold (DOD oil solenoid pack; controls/feeds AFM lifters, must be tested/replaced)
OEM # 12571609Also fits: ACDelco / GM Genuine 12571609, superseded by GM 12698755 (VLOM with solenoid), related 12676935 / 12697807$130–$280
GM 12571609 VLOM, ~$269 genuine (GMPartsGiant); GM released updated 12698755 to address AFM problems. Required on an AFM-keep repair; on an AFM-delete it is replaced by a delete valley cover (e.g., Dorman 615-906) instead.
Cylinder head gasket set (heads must come off; AFM valley/perimeter gaskets included)
Also fits: Fel-Pro HS26191PT-1 (2004-2008 4.8/5.3, VIN B/T/V/Z), Fel-Pro HS 26191 PT, Mizumo full gasket set 4.8/5.3$70–$160
Fel-Pro HS26191PT-1 is the canonical 5.3 head gasket set; OEM GM head-gasket-set PN not cited with confidence so left blank. Fel-Pro is the standard service part for this job. Verify VIN/year for exact head-bolt config (2 designs exist on 2004).
Replacement camshaft (only if an AFM cam lobe is wiped) / non-AFM delete camshaft
OEM # 12689035Also fits: GM 12689035 (genuine Gen IV non-DOD/AFM single-bolt 5.3 cam), Melling MDK400 (Gen V L82/L83/L8B MDS-delete cam+lifter kit), COMP Cams LS Gen IV 1-bolt VVT w/o AFM$200–$450
If a cam lobe is damaged, replace the cam. For a stock-style non-AFM repair on Gen IV, genuine GM non-DOD cam is 12689035. For Gen V (2014+ L83) use an MDS/DFM-delete cam kit (e.g., Melling MDK400). Caution: 12586481 (seen in searches) is the camshaft SPROCKET (~$35), not the camshaft — do not subst
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