Hi,
Sounds like your piston rings are not sealling yet. You may have broken rings or the end gap was correctly set. Do a compression check. Check the hose from the PCV valve to the intake manifold. If has oil in it, then you have too much pressure inside the engine. Seal the grommet on the valve cover, seal the dipstick tube. Put a pressure gage (vacuum/fuel pressure gage) into the grommet for the PCV valve in the valley cover. Nominal pressure should be around 5-7 psi. If more, then rings are the problem. You can try this: put 2 containers of STP into the oil. Run the engine at about 1000 rpm until it warms up. Shut it off and let it cool down completely. Repeat the process. The STP will seal the rings better than low viscousity oil.
It may be that the gaps of the compression rings are aligned and allowing the pressure to easily escape into the interior of the engine.
Hope this works, let us know.
Mike
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1968 Pontiac GTO 462CID, 4-Speed Manual, 3.55 rear. Aleutian Blue exterior, 219 Teal Blue interior. Chrome bumper, AM & 8-Track and Rally II Wheels
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