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Neil...doing a 560 here too.
Smokes from left bank on start up only...I had the complete exhaust off.
Will replace all valve stem seal first and then run it up for a few days.
The oil burning in this machine stopped up the cat's. Got 10 psi back pressure.
The valve guides and valves are most like in good shape even at high miles, and 140K is not high..
Make sure the blowby is reasonable and the breathers are working.
With the valve covers off,you can determine if the plastic guides are in need of replacement....tedious job, but if okay, roll in a new chain.
There's no way off checking guide seals ....I just replace them.
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