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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.
RE: projected tip or non-projected tip spark plugs
How far the tip of the spark plug sticks into the firing chamber. OEM is non projected. Stick with the OEM style or you could risk smacking a plug with a piston.