I recently just built a 331 stroker enginewith a D1SC blower for my 94GT. I seem to be having a problem with excessive crankcase pressure coming from my engine. I can hear the oil pan either implode a small amount or get pushed out because when i turn the car off and about 5secs afterward you hear it, plus it will puke a small amount of oil out of the pass side breather filter. Also the car leaks oil from the front and rear crank seals due to the excessive pressure. I not sure if this is from the cam being so radical, some have told me so. I have a flowtech induction custom grind, roughly 610 lift. The car pulls 6-7inch of vacume at idle. It does not have any vacume leaks and does not smoke at all. So far there are about 300 miles and 20 dyno tuning pulls on the car and it runs great except for the oil leaking out of the seals and the pan making noise. Some info is i have tall aftermarket valve covers no baffleswith a breather filter open to atmosphere on pass side, no breather on drivers side, new factory PCV valvehooked to upper intake (Trick flow track heat). I am almost positive this is from excessive crankcase pressure because of the pressure pushing or sucking on the oil pan. I think in my opinion that it tends to build more pressure at idle, because sometimes when i whipe of the bottom of car, go for a drive, there will be no oil, but when i idle, it will build pressure and drip from both seals, then i shut it off, i hear the pan and it might puke a small amount of oil out the breather onto my headers. I know that baffles will stop the puking of oil but what can i do about the pressure. This is all done without boosting it, and just normalidleing. Could the engine not be broken in yet, if so i built ALOT of engine and never seen them leak when there not broken in, Plus it has 300miles and i am sure after 20dyno tuning pulls it would be broken in by now.
Thanks for the help
-Tom

 

Oh, and i didnt want to add any type of evacuation pump, only because i want the car to stay streetable.

 

I just got a paxton SC for my 91 stang & in the install book it said to relocate the blow by tube, wich is the 3/8 hose going from your oil filer neck to your t-body. it said to plug the port at the t-body and run the hose over to the air filter box or to put a breathable crank case filter. but my understanding of all this was that if the blow by tube was not relowcated that the super charger would blow boost through your t-body down the blow by tube and into your valve covers, wich may be your problem.