I own a 1964 Dart GT, it's resto and I am nearing the phase where I can start to worry about the engine.

It currently has the original 225 Slant Six and I have installed a Super Six intake manifold and 2 barrel carb to boost performance.

But alas, I live in California and gas prices might give me a heart attack (I'm a new driver and this is my first car). So as I see it I have a few options.

1. Leave the six in the car and drive it with the 2 barrel setup and pray that I can afford gas.

2. Pull the multi-port fuel injected V6 out of a 92-95 Dodge Dakota (with transmission and computer) and hope that it's more efficient in this car.

Which is the real issue.

Which is more fuel economic for my application the original 6 or the Dakota V6?

Any help would be appreciated!

Thanks

A thought. Assuming your carb is a synced opening 2 bbl you might consider putting in a staged 2 bbl so it can run a lot on the small barrel. But only if you think you can keep your foot out of the carburetor, punching up that 2 bbl performance.

Anyhow theory has it the above is true and I've read a couple claims that people have, indeed, been able to take it easy and get top mileage out of, for instance, the 32mm barrel of a 32/36 pair.

what kind of numbers though city/highway (rough estimate)

that verses the V6 (if possible to roughly estimate)

THanks for the info

Yep. Any kind of feasible engine swap will cost you a great deal more than you'll make back in gas savings in the calculable future.
Well, or modify/replace the present intake setup for a more economy-orientated one. The staged setup RossKinder mentions is one such option.
You will spend a lot of money to do this swap even halfway cleanly. Many new parts will be required, a goodly proportion of which do not exist and will have to be custom-made. The transmission will not fit your car without extensive floorpan and frame member modifications, for example, and you'll have expensive hassles trying to figure out how to hook up the speedometer. And those are only two of many issues that will dog such an effort.

There are lots of tweaks and mods you can make to a slant-6 car to get better mileage. What is your exact setup? Which engine, which trans, which rear axle? Do you do mostly city or highway driving?

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Too many people who were born on third base actually believe they've hit a triple.

my current setup is a 225 six with 3 speed torque flight auto transmission.

Rear unknown and I suspect that most of my driving in the forseeable future will be city.

if this helps great, if not lemme know!

Search for the old subject heading "30 mpg club". That'll give you lots of ideas.

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1973 Dart Swinger Super 6 with 71k
1976 Datsun 280ZX with Mopar I-6

I have never seen a 3.9 that got good enough fuel economy to make that swap worthwile. I had a slant that i didnt try to make faster that got good mileage like mid 20's but you had to drive for economy. The biggest detriment to fuel mileage is the loose nut behind the wheel.
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Suzuki dr800s
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Marijuana Vaporizer

WHAT?! No rubber patches leading from the stop light?!?

It amazes me how many people want to burn rubber and get good gas mileage.

Why not, it's still do able with the right tuning and set of parts... (now expecting 40 mpg and a 12 sec 1/4 time is kinda not gonna happen)


-D.idiot

I agree with 74.Swinger a lot... In the last couple months I've really tried to pay attention to *how* I drive... Not stomp on it from the red lights, fill up every half tank, drive 55, etc... It definately makes a difference...

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1973 Dart Swinger Super 6 with 71k
1976 Datsun 280ZX with Mopar I-6