thanks for the info, I will check that in the follow days...
for the moment, here are some pics of my L6 engine after some cleaning...
I will open the engine in the follow days, to see if I need to overhaul the engine
I found this numbers and codes in the block, what mean that?
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1988 Ford taurus LX SW
V6 3.0L vulcan - Axod
1973 GMC Jimmy Sierra 4x4
L6 diesel nissan LD28 (temporal engine)