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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
You can almost guarantee yourself you need to replace the rings.Its not bad at all hell you already have done the hard stuff.While its apart go ahead and have it checked and tested for breaks and cracks.</P>
But at a 150,000 miles while its down that far you might as well do it right.</P>
take it to the machine job and have it chacked..if walls are ok you have them hone the cyl. for chrome moly rings,put in new cam bearing,freeze plugs and oil galley cleaned....all thread taped