Hey guys I'm new to this forum and am looking for an answer of why I might be getting Oil in my coolant. I have a newly rebuilt EBV 239 Y in my 55' F350.  I have flushed the cooling system 3 - 4 times thinking I might have some residual oil in the block but oil keeps coming back. It is only a small amount leaking  because my Engine oil on the dip stick is not dropping. I have re tightened all bolts and done a compression test  with the results bellow. Any of you guys ever had this happen or have an answer of what might be causing this.