I rebuilt the top end of my '80 911SC about 40000klms ago but sometimes theres a puff of smoke at start up and alot if left idling when hot. Found quite a bit of oil in intake to oil filler neck hose. Is there an EGR valve or could the 2 breather hoses be the wrong way around, HELP?

 

The puff of smoke at the start up is normal for just about all Porsche... Dont know why it would smoke after idling.. Mine will smoke for a good 5 to 10 mins if i dont start if for a week or so.