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Someone post a picture of the oil relief groove...
I think this was a groove we ran into when we were putting Chris Streit's motor together. If I recall correctly, and if the groove is the one we were looking at; then it is a path of least resistance for the oil to return to the case instead of being pushed out the case seam in that region. There is no stud at the corner, and it is what I suspect to be a weak region along the case seam, so the groove allows the pressure relief in a designed manner. Does that make sense? Post a picture Wayne..I don't have my book with me...
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