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Old May 20, 2004 | 08:41 PM
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ford390gashog
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main jets

what are the factory size of main jets in a motorcraft 2150 2bbl from a 1975 ford f 150 with a 390 and what are the best ones to go with for gas mileage
 
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Old May 25, 2004 | 10:24 PM
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Iam running # 55 in a 75 Cougar with a power valve that open at 10. inchs and it runs great. Gets around 15 mpg if you drive it right.
 
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Old May 26, 2004 | 06:46 PM
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ashvalentine
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Stock jets are 56 or 57. You can try 55 but it may well run hotter and/or ping.

ash
['You're going to have to experiment.']
 
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