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Following a recently less than succesful rebuild,
my cars back in mechanics, with intermittent smoke.

following a series of engine in car tests, in an attempt to localise the source of
smoke, He's tracked it down to cyl#3 when the engine stops at a certain point.

(determined by marking crank pulley) and observing start-up with exhaust removed for signs of oil being chucked out port.

He's hoping for a relatively easy fix, possibly inlet valve
anyone else here heard this a likely culprit ?

Mysterytrain

smoking at start up only??

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And either first time in morning, or anytime during day hot/cold

and a good puff as well, enough to seriously **** off anyone standing beside car

ie; not the expected puff they all do
including mine not so long back

so i know what I'm reffering to

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Might a faulty injector have.

My mechanic seems under the impression, an injector might be dumping un-burnt fuel, via inlet valve in such a copius quantity,

its where the smoke is occasionally coming from.

I've not heard this, at least on anything other than a diesel.

he's taken a look at the rest of head, and thinks the valve seals look in order

so if its oil causing it, he's unsure where it originates