Dodge 440 Low Power

[Jer4sports]

I have 78 Chieftain with a Dodge 440.  Going uphills from 0 mph, it only gets to about 35-40 mph.  On the freeway, if I'm traveling at 65 mph, it can't sustain that speed going up even shorter hills where it'll drop down to 50-60 mph.  I'm also only getting about 5-6 mpg. 

Can anyone give me any ideas as to where the issue might lie? Carburetor?

Thanks, Jeremy

[Rickf1985]

When was the last time it was tuned up? The mileage is about normal. Did this change from before or is this a new vehicle to you?

[Jer4sports]

I bought it used back in October. The previous owner said he had it tuned up a little less than two years ago where he replaced the spark plugs and whatever else. I know these rigs are heavy, but I feel like I should expect more out of a 440, right?!

Only thing I know of that's wrong with the chassis is that there is an exhaust leak.

[LJ-TJ]

 i?? Well as far as mileage that sounds about right. If I drive my 21 footer I get on average 4,5,6 miles to the gallon. When I let magic feet drive "the wife" she can consistently get 8 to 10 miles to the gallon. Go figure. I'm in agreement with Rick. Sounds like she needs a real good tune up and maybe check your timing. These old girls are nothing more than a glorified hot rod that you have to be tweaking all the time. Hm?

[Rickf1985]

Also keep in mind that with the alcohol in the gas nowadays the power will be down a bit and mileage will be down more than a bit. Thank your politicians.

[Froggy1936]

More info needed, Do you have a 4 bbl carb ? is it useing all 4 ? Where is the timeing set to ? Frank