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Old Dec 18, 2006 | 06:06 PM
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hp gain?

I was wondering what kind of hp gains i would get from a set of black jack full length headers on my 87 f25 351w. Thanks everybody.
 
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Old Dec 18, 2006 | 09:19 PM
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Moved to proper forum.
 
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Old Dec 18, 2006 | 11:16 PM
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Asuming you are not using the factory cats with this I'd say you're looking at 20hp for sure, but the biggest gains will be in low rpm torque. BIG DIFFERENCE!! The next best thing you could do after this is put a cam in it, either the one I have or the Comp Cams 31-255-5. You won't believe the difference these 2 thing will make. If desktop dyno is right it's at least 50hp and 75lb ft of torque.
 
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Old Dec 19, 2006 | 05:54 AM
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Just a clarification on cam numbers; 31-255-5 is for the 5.0L engine. Since you have a 351 you would need the 35-255-5.
 
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Old Dec 19, 2006 | 02:04 PM
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thanks so much you just made my day, headers should be here tommorow.
 
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