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780cfm holley mpg

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Old Feb 6, 2008 | 10:19 AM
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crescentwrencher's Avatar
crescentwrencher
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From: fallbrook ca.
780cfm holley mpg
hi, ive got a 75 f250 4x4 with a 390 and 780cfm holley on it, will this kill my gas mileage?

also it is leaking gas like a siv out of the float compartments
 
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Old Feb 9, 2008 | 12:27 PM
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rusty7983
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From: hohenwald, tn
that is a big carb for a 390. do you know where exactly the leak comes from? is it the bowls themselves? those gaskets and the carb itself is easily rebuildable. and for cheap money.
 
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