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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.
well they have better valve control, dont even need aftermarket heads usually(stock cobras w/ 1000+ hp on stock head). i was talking more about the design than the cost to mod. they are really expensive to mod though i would say. the other thing is you usually dont need new cams w/ a 4 valve to make good power(obviously when you get way up there you do, but its easy to hit some pretty crazy #s without them)