I have a 360 small block. Oil pressure cold is 70 psi, oil is 10-30. I have checked the shafts for the rocker arms and the groove is down front on the left bank and down rear on the right bank. I switched back to stock stamped steel covers hoping that would help. Gaskets are glued to the cover only. Motor is a mid 1980's. Head milled .020, performance cam and springs. Stock type flat tappet lifters, pushrods and rocker arms. I am frustrated. Any suggestions appreciated.