I have a 93 as well and was experiencing mild blow-by, so I removed and cleaned the valve cover and baffles, resealed it and also cleaned the tubes to the breather and CCV... problem solved... sounds like your is building some serious pressure though...
93 YJ, 6 cyl,3.5" BDS,1" Prothane BL,1/2" booms, 33" Mickey Thompson MTZ on MT Beadlocks.
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