Thanks for the replys guys.

No its not a new build its an old engine that looks like its been rebuilt in the past, My tuner also reckons its valve guides.

i just cant get to grips with the way it drives fine with no smoke until youre on boost!

I took the pipe from the oil breather to the manifold off last night and there is oil in there.

I took out the one way valve whingy that is in the plenum and blew through it and oil came out of it.

Theres not supposed to be oil in there is there?

Im told i can block that pipe off at both ends so im ging to try that.