The valve job was done when the head gasket was replaced. The valve guides and seals were all replaced. Again the noise goes away once the car get to around the halfway mark to operating temperature and does not return at all. Even when I do hear it the noise is very faint and can not be heard over the radio at medium volume or the blower going. Is it possible that there is one or more lifters that isn't building sufficient oil pressure until a bit of driving? I do get a bit of faint lifter chatter on the odd occasion but it goes away after 1 second.

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1989 300CE