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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.
Some were 580's and some were 600's.
I dunno why the differance unless California had it's own thing due to emissions laws.
Both were vacumn secondary type.......
CARB??
....and why do you need to know this??? 
