1998 Bravado valve adjustment problem

Hello all, new to this. I had a catastrophic failure of the lower intake manifold which dumped all the coolant into the oil pan through the valley below the intake manifold. The drain oil was thicker than molassas. Cleaned all I could with paint thinner. After replacing head gaskets, and all other gaskets above the heads, I am now stuck with valve issues. When attempting to start the engine I had no compression. I tested cyl. 5 & 6 with compression tester and read zero psi. Removed valve cover from right bank, and discovered when I tighten the rocker nut to the bottom the valves get compressed about 1/8 to 1/4 of an inch. Is it possible that I have clogged the oil gallary the supplies oil to the lifters, and the lifters may not be going all the way to the bottom when the valve should be closed? Please help! Thanks - moodman6

What engine have you got?