289/302 gas mileage?

What is the best mileage anyone gets running a 289 or 302 on the freeway?.....I am thinking of swapping the 352 ci (15 mpg) with a 3 speed stick tranny in my 1966 Ford pickup truck with dual exhaust, to a

289 or 302 and adding headers, a dual plane manifold and a flex or electric fan in hopes of getting over 20 mpg

What do you guys think?

Much Obliged Patrick

Reply to
Ridin' 4 Jesus
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You will never realize a return on your investment(time and/or $$).

It will still require about the same amount of energy to move your vehicle, save for the modest weight reduction.

If you need to go to such an extreme, go straight for the 240 or 300 I-6 with a 1 bbl. carb. You may reach 20/21 mpg highway with the long-stroke six. 17 is a reasonable MPG expectation, though.

Rob

Reply to
trainfan1

Might also want to remove the windshield and duct tape on a new one with a better rake. That '66 pickup must be a brick on the highway.

Better aerodynamics might go further than an engine swap.

dwight

Reply to
dwight

I have a 66 GT A-code with a slightly modified 289 (Eddelbrock Intake, Holly

570 carb). It has auto trans and 3.00 gears in the rear and I am seeing about 16.5 mpg combined city/highway driving. I did notice if I cruised the freeway at 80 mph I was only getting 13 mpg. I tried dropping my speed down to 70 and my mileage shot up to 16.5. Im sure if I were to swap the stock 3 speed for an AOD I would see an even better improvement.

Reply to
DCH

Will you get 20mpg with a 302? Maybe. But you have to be very carefull on how you build it. Mild cam, EFI, electronic ignition. Don't get to carried away here, or any savings you might make will be eaten up by fancy parts. Your best bet would be a late model 5.0 from a Mustang. That way you get the proper computer and a T5 trans. I'd almost bet there's off the shelf parts available for this swap. As someone else mentioned, look in other areas for savings, too. Reduce weight. Skinny tires. Better aerodynamics. Driving style. Do the math. What mileage do you get now? What will you spend to do the swap? How many miles will it take to recoup the expenditures? Of course, a 5.0/T5 in a '66 pickup would be a lot of fun to drive. So don't forget the fun facter; that's got to be worth something :)

Reply to
.boB

".boB" wrote in news:4638b420$0$20105 $ snipped-for-privacy@news.usenetmonster.com:

With a 352 in a truck, he's probably not getting mre than 11 or 12.

Reply to
elaich

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