Message: 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!!!
P 1
Post a reply to this message:
Username Registration: Optional All visitors are allowed to post messages
Subject: 3.9L bored over?