If it doesn't burn smoke on start up after sitting, it is probably not the valve stem seals. My best guess would be worn rings, or a stuck pcv valve. Most likely rings and you are getting alot of blow by. Check compression with the motor at operating temp, then at a cap full of oil to each cylinder and let it sit for 5-10 minutes, then recheck. If compression goes up significantly on any cylinder, you have worn rings, and they would need to be replaced.
If replacing the rings, you MUST have the cylinders checked to see if they are out of round. If not, a quick deglaze and hone should do the trick, and you can simply install new rings. If they are out of round, you would need to have the cylinders bored and honed and get oversized pistons and rings.
If you simply throw new rings at worn cylinders, it is a band aid. It may not smoke at first, but I can assure you they will fail in shot time.....i know from experience.
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