I have recently picked up an '87. I can turn a wrench just fine however my diagnostic skills are not as high.
When running there is a slight tick near number three exhaust valve. Doing a compression test dry all 4 cylinders test 130-135. When wet 1,2,4 go to 145-150 while 3 stays at 135. I have not done a leak down yet as I don't have a setup to do so. EGR has been eliminated.
The pressure in the case seems to of blown out my oil pan gasket. Oil and coolant both look ok.
My buddy believes that I have a bent valve and that is causing my pressure in the crank case.