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I recently fitted a reconditioned head, complete with VRS kit to my 2000 1.8ltr (7A-fe) Corolla following a blown head gasket. The engine starts but forces oil out the rocker cover and/or cam seal at the timing gear end into the timing gear/belt housing (between a and b in images provided) Also, i have only 60 psi compression in cylinders 2 and 3. 1 and 4 have 180psi. What are likely causes? How do i correct these problems? Piston rings?? Please advise