1990 5.0 gt40 heads - Mustang Evolution

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Old 10-29-2013, 08:46 PM   #1
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1990 5.0 gt40 heads

What kind of gains will I see from gt40 heads?
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Old 10-30-2013, 10:38 AM   #2
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I believe about 50 to 60 hp
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Old 11-01-2013, 01:51 PM   #3
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Depends what else is done to the car. A stock Cobra(that also has the Cobra intake) dynos around 230whp, a stock GT dynos around 190whp so you will see roughly a 40whp gain from the GT40s and a good intake. They are a great budget head but don't spend more than $300-$500 to get a set on your car and that includes completely going through them, new springs/locks/retainers/valve job.
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