replace oil check valves?

[Joel Lenorovitz]

I've got the intake manifold off of my '95 90Q and was wondering if, before I put it
back on, I should replace the oil check valves which are located under the vally pan
cover.  I remember seeing a few posts on these valves and from what I understand
they serve to prevent all the oil from draining out of the head when the engine is
shut off.  I do have some lifter noise, but I wouldn't call it excessive or abnormal
and it doesn't seem to be worsening.  This would be strictly a preventive move.  Are
these valves very prone to failure?  Are they expensive?  Unless I get a compelling
reason to change them and/or the cost and difficulty associated are very low, I will
probably just leave things as is.  Please advise.  Thanks,

Joel

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