Wierd sounds comming from oil

[Corman12345]

Here it is. I just replaced my valve stem seals and when I had the compressed air hooked up to all of the cylinders to keep the valves from falling in the cylinder, i kept hearing the oil in the motor churning and splashing loudly. I then did a compresssion test and all four are running at 152 psi. the only thing i could think of is a blown head gasket and the air leaking into the oil, but i just replaced that about 6 months ago and the compression tests kind of ruled that out. I was just wondering why this would be and if i should be worried about it

thanx

 

[dsm1kenobe]

did you hook up the compressed air to the inlet of the turbo? if so, you could be blowing air past the turbo seals and through the turbo drain line.