B150 1/2 Ton Van V8-318 5.2L (1985)
FIGURE 3. Holley 5220 Primary High Speed Bleed #180
FIGURE 4. Holley 5220 Secondary High Speed Bleed #210
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Remove primary and secondary high speed bleeds. Refer to Figures 3 and 4.
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Install #180 primary high speed bleed PN 4342920.
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Install #210 secondary high speed bleed PN 4342921.
FIGURE 5. Holley 5220 Power Valve Location
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Turn power valve (Figure 5) two full turns counterclockwise (lean).
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Reinstall air horn with new air horn gasket PN 4293846. Start engine and check for leaks.
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Warm up engine and set idle speed to that specified on the VECI label.
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Type in changes made on Emission Update Label PN 4275084 and affix to engine compartment next to VECI label.
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The high altitude adjustments are now complete.