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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

1985 f-250 460 or 351w

 
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Old 05-15-2019, 10:26 PM
Mcfaddju032100
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1985 f-250 460 or 351w

I have a 1985 f-250 and it currently has a 460 in it but I would like a more fuel efficiency could I stay with the 460 and make it more efficient or would a 351w made with a little more power be a better ways about things Iíd like to stay 7500 or less on the build
 
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Old 05-16-2019, 06:34 AM
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Better MPG and an old pick up don't belong in the same sentence.
If you do go with the 351 you will also need to swap transmissions as the 460 & 351 have different bell housing bolt patterns so more $$ there.

What gearing does the truck have?
What do you use the truck for most of the time?
Is it hilly or flat?
4◊4 or 4◊2?
What are you getting for MPG?
Dave - - - -
 
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Old 05-16-2019, 08:52 AM
Odisvan
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no way would I switch from a big block to small block only to get the same gas mileage in the long run, or within 1-2 mpg at most. It's the huge brick pushing through the wind that's the issue.
 
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Old 05-16-2019, 11:03 AM
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Originally Posted by Mcfaddju032100 View Post
I have a 1985 f-250 and it currently has a 460 in it but I would like a more fuel efficiency could I stay with the 460 and make it more efficient or would a 351w made with a little more power be a better ways about things I’d like to stay 7500 or less on the build

In this instance, you would be better off going to a 351W. The $7500 budget will allow you to swap the engine and install a built AOD. You will easily be able to replicate or exceed the current HP and torque of the current 460 and get better fuel economy to boot. Plus you will have the option of selling the 460 and it's trans to recover some costs or increase your budget.

The 460 can be made to get better fuel economy but it will never match the 351W and unless you are towing over 10K lbs there really is no need for the 460. If you are, keep the 460 and build that.
 
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Old 05-16-2019, 11:16 AM
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If you want fuel efficiency and to maintain power a i4 diesel would be about the only thing I could think of. Cummins makes an engine specifically for retro fitting into trucks. It's 160hp [email protected] that weighs 500lbs and is about 2 ft square, comes with everything but the adapter plate for a transmission. It's done this way on purpose allowing it to be adapted to any transmission. Unfortunately no SEMA folks are making adapter plates currently for stock for transmissions, I here it will fly with a T56. Just happens to cost $7500+ transmission adapter.
 
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Old 05-16-2019, 02:07 PM
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I live in Wyoming thereís a lot of hills to go up the truck is a 4x4 and I use it for a commuter and I carry my dirt bike and a camper trailer about every two months for work and I was thinking about putting the zf5 speed trans in and Iíd be able to add more each month as I now have a job that can support my problem haha
 
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Old 05-16-2019, 04:59 PM
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The zf swap would be a positive thing to do, and give good MPG results. I have the 7.3 diesel in my f250 with 4.10's, 4 inch lift and 35 inch tires. I could not get over 12 mpg with it. It originally had the c6 auto. Changing nothing else, just the trans to a 5 speed zf, I gained 3 mpg. And it is much quieter and more enjoyable to drive on the highway. And look how much less engine wear I have now.

I kept looking for a trans, I could not find one cheaper than $1000. I ended up buying a wrecked donor for $1000 that had the zf in it. I got all the parts I needed for the swap, and I also was able to sell the wheels, transfer case, and other odds and ends, plus a few parts I did need for my truck also. So that brought the cost of the tranny swap way down.
 
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Old 05-16-2019, 05:35 PM
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What trany does the truck have in it now?
If auto and want to swap in a ZF a donor truck I think is the way to go.
Now if you have a stick you can do the ZF swap a little easier, the thing is finding a good one from what I hear.
OR
Go with http://www.advanceadapters.com/categ...-splitter/236/
and you get to split all the gears for when you need something in between.
And with the money saved over the $7500 budget you can go out for a few good meals.
Dave ----
 
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Old 05-16-2019, 09:42 PM
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The truck is a 4 speed manual not sure if itís a t19 or t18 though and I found some zig 5 speed from a website called spprecision but Iím not sure if itíll work as Iím new to this stuff but I have the drive to learn
 
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Old 05-16-2019, 09:49 PM
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Thanks for the comments so far
 
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Old 05-17-2019, 02:49 AM
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You will have to search but there are post on the ZF5 to 460 swap.
2 of the biggest things I remember is you need one from a big block, small block & diesel will not work.
The other is finding a good used one.

As much as I hear the ZF is a great swap if you hang a stick, T18/T19 I would look into the Advance Adapters spliter as I think with either the ZF or spliter you have to deal with drive shafts.
Just my .02
Dave - - - -
 
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Old 05-17-2019, 04:28 AM
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It depends what your objectives & priorities really are.

With your $7500, you could take $5000 & buy a pristine 300 I6 2wd truck for economical commuting, while keeping your current 460/T19 truck, in stock form, for the bi-monthly bike/towing trips.............& still have $2500 on hand to feed it, or spend elsewhere.

But if a fun re-power project is actually what you are looking for, economics tends to go out the window.........
 
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Old 05-17-2019, 06:02 AM
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Originally Posted by Ken Blythen View Post
But if a fun re-power project is actually what you are looking for, economics tends to go out the window.........
100% truth right there lol.

Is spending $7500 to get 2-3 mog worth the hassle.

Is spending $10,000 worth getting 15mpg more... IDK but could be fun.
 
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Old 05-17-2019, 08:39 AM
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Yet another AARP type thought (because I am old), if some idiot hits you and totals out your truck, you'll get book value. Something to think about on an 85 you're about to invest $7500 in. Look up book value if you're unsure. I drove my 84 f150 home for $800, and have my $300 90 F150 running now, and drove my 97 supercab home at $2K. I know, I know "I'll NEVER sell MINE!"....and you might have ZERO intentions, but guess what happens if you do get hit. It's straight up simple math, no matter what. If the dollars to repair add up to around 70% of book, you get book regardless.
 
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Old 05-17-2019, 09:14 AM
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Originally Posted by Odisvan View Post
Yet another AARP type thought (because I am old), if some idiot hits you and totals out your truck, you'll get book value. Something to think about on an 85 you're about to invest $7500 in. Look up book value if you're unsure. I drove my 84 f150 home for $800, and have my $300 90 F150 running now, and drove my 97 supercab home at $2K. I know, I know "I'll NEVER sell MINE!"....and you might have ZERO intentions, but guess what happens if you do get hit. It's straight up simple math, no matter what. If the dollars to repair add up to around 70% of book, you get book regardless.

You should be able to get an adjusted policy for after market modifications or antique/collectors vehicles. I have talked to my insurance about that. You are correct, basic daily liability policy your getting $5000.
 

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