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I have a 1985 ford f250, auto.,air,460. If I add a highrise manifold
will I increase my milage?
 

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maybe slightly but it probably wouldn't be worth the effort unless you are going for performance and are willing to do more and even then you would more likely notice the performance more than the gas milage.
 

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gas milage

You cant beat the factory intakes for gas milage. I always change to aluminum intakes when I do an engine or project; because I like to get all the weight I can off the front end for numerous reasons. The intakes I use are all dual plane which are closer to the make of a factory intake but lighter. I use any I can find cheap and they are all pretty close in output ;a little more performance potential but if your just thinking of gas milage , stick with the factory.
 
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