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Your 1984 2.5 four should never ever need an adjustment.

But if you have noisy valves, remove air cleaner and valve cover.

Check valve lift (it is likely if you have noisy valves the camshaft has failed)

If all checks good, Rotate engine until each valve is on the base circle of the cam, adjust valve until there is no lash or slop in the rocker and tighten an additional 1/2 turn.

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Q: How do i tighten the vales on my 84 Pontiac fiero?
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