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10:59:16 - 09/21/2021

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6/29/2021
21:07:22

Subject: 3.9L bored over?
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A few years ago I had my 3.9L bored 30 over and rebuilt. I wanted more HP and pep! After the rebuild, I lost nearly 100 miles of fuel mileage on a tank of gas! I also read that being bored 30 over would equal to a 4.7L??? If so, would I need a new PCM for a 4.7 despite my engine being a 3.9 but bored over??? Thank you for any information!!!



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