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Old 08-09-2009
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If your intake manifold gasket is leaking, it would be a vacuum leak. Blow by refers to combustion gasses entering the crankcase, past the piston rings. If your exhaust valve stems were leaking, you would have some blow by into the valve cover, but not much. If your intake valve stems were leaking, you would be pulling oil into the combustion chamber, and probably notice smoke in the exhaust. I suspect your exhaust manifold / heat exchanger gasket is the culprit remove it clean the surfaces, and install a new set. Torque to mfg. specs, and then after 10 - 15 hrs, retorque.
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