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My 73' series III smokes too much. Runs great but a blueish smoke comes out the tail pipe. I was thinking I might have a stuck valve. I was thinking of pouring sea foam down the carb. Any ideas/recommendations?
 

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Sounds like a blown oil ring in one of you're pistons.

Do a compression check. Then run another compression check, but first squirt some motor oil into the combustion chamber. If the compression is higher the second time, then you have a blown oil ring. Also look at you're spark plugs and compare all 4 of them.
 

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Valve stem seals
 

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tobbjo said:
Valve stem seals
If the valve stem seals are worn you usually just get a puff/cloud of blue smoke on startup, not continuously. But if they are completely shot it could be worse I suppose.

I secong the oil ring - It can't be the compression rings though otherwise you would be pressurising the sump and oil would be going everywhere inside the engine bay (more than usual).
 
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