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I was going to have mine replaced. It showed the same symptoms: a brief cloud of blue smoke at startup after sitting for a few hours. No blue smoke afterwards.
The mechanic I asked about replacing them said the seals are really cheap, but the labor required (removing brackets/components that block assess to valve covers) was a little expensive. He said it would cause me between $200-$300 for everything (seals and labor).
The heads do not need to come off, the seals can be changed by removing the valve covers, filling the cylinder with compressed air or small rope to prevent valve from falling, and removing the keepers, taking off the old seal, installing new seal, re-installing keepers and valve covers and all associated brackets/equipment.
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