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I would just like to let you know about my experience with no oil pressure in a 3.1 that I overhauled. When I first started the engine the oil light would stay on and after speeding up the engine it would flicker and then go out. At idle it would come back on. I put a gauge on the engine at the oil sending unit and the oil pressure was fine. I think there was air between the oil pump and the sending unit and it was giving a faulty reading. After I replaced the sending unit it was fine. Another thing I did on this same engine is when I put the timing chain on I used the wrong mark for a timing mark and The engine would lock up. Thank God I figured it out before I ruined the engine. Hope this helps you.
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