F 150 Heritage 4WD Pickup V8-5.4L SOHC VIN Z Bi-fuel (2004)
2004 and 2005 MY lash adjusters can be visually identified by the presence or lack of an identification groove cut into the lash adjuster boss (Figure 3).
The 2005 MY parts will have this identification groove cut into the boss, while the 2004 MY parts will not.
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