Need Carb Help
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Freshman User
Joined: Oct 2008
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Need Carb Help
I just inherited a '75 f250 from my brother and need to get it running. It currently has a 460 bored out to 472 and a holly 780 double pumper. This was a hot rod for my brother, but I have more practical uses in mind for the truck. The carb needs rebuilt, but I would like to replace it instead. I would like the truck to be a little easier on the gas I need it to haul/tow heavy loads, but not at 100mph. Any thoughts?
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
I know this isn't what you were wanting to do, but you asked for people's thoughts, and my thought is that it'd be cheaper just to rebuild what you've got. I could see replacing it if it just had a stock Motorcraft by Holley carb but since it's already got a double pumper I would probably just rebuild it.
Tuned
Joined: Apr 2006
Posts: 335
Likes: 2
From: N of Houston, TX
I've gotta vacuum secondary, electric choke Holley 750 on my 460 and she's a bad ****...power when you need it and no headaches on tweaking. I've run Edelbrock and they're a pain when it comes to getting it set right.
Tuned
Joined: Apr 2006
Posts: 335
Likes: 2
From: N of Houston, TX
Not sure what the tow rating is for your rig, but if you use taller gears and tow a loaded trailer you're definitely gonna see a higher gas expenditure in comparison with the 4.11s...tire size plays a part too.
Tuned
Joined: Apr 2006
Posts: 335
Likes: 2
From: N of Houston, TX
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I haven't found anyone that will give me a free Prius, the truck was free, just try to figure out how best to use it.
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Laughing Gas
Joined: Mar 2007
Posts: 754
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From: southwest Wisconsin
Well, lets do the math. If you drive 10,000 miles a year @ 10mpg you will use 1000 gallons of gas. Let's just say that an overdrive will give you an additonal 2 mpg. If you drive 10,000 miles a year @12 mpg you will use 833 gallons of gas, 166 gallons less. At $2.50 per gallon you'll save $415.
Are you going to drive this truck 10,000 miles a year empty? As you said, loaded miles will not be effected.
If you drive the truck 5,000 miles a year empty you will save a little over $200.
If you spend $1000 installing an OD, It will take 5 years to break even at that rate.
Of course the price of gas will fluctuate, savings with OD may be more or less, this is just an example of how to pencil it out.
Are you going to drive this truck 10,000 miles a year empty? As you said, loaded miles will not be effected.
If you drive the truck 5,000 miles a year empty you will save a little over $200.
If you spend $1000 installing an OD, It will take 5 years to break even at that rate.
Of course the price of gas will fluctuate, savings with OD may be more or less, this is just an example of how to pencil it out.