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Message: <blockquote data-quote="71ProjectJunk" data-source="post: 405437" data-attributes="member: 7655"><p>You can get decent gas mileage from a 351W if you get a good 6 speed transmission, and don't go crazy on the rear end gearing or camshaft. I bet you could get 20 MPG+ with EFI, a 6 speed trans, 3.25 gears, and a cam with about 215 degrees of duration at .050 or less. Some good heads with smallish ports and a good dual plane intake. Need to keep the velocity up on the intake side. Some good headers and a good dual exhaust should complete the package. Remember that a 1987-1993 5.0 Mustang GT got 22 mpg on the highway and 15 MPG on the city, 17 MPG combined with a 5 speed. The 351W is a little bigger engine so the fuel economy will suffer a bit, but it should still be close. You need to calculate how much you will need to spend to get a new engine and transmission plus all the fabrication VS how much better gas mileage you will get. Also how much you will actually drive the car. Most of these cars are weekend drivers and are lucky to do 1000 miles a year now. I know mine don't get close to 1000 miles a year.</p></blockquote><p></p>

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