Inline Six
Senior User
Joined: May 2007
Posts: 190
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From: rural Idaho
Originally Posted by AZ_Catskinner
I've had a 78 F250 4x4 with a 351M, and an 84 Bronco with a 300 - the F250 actually got slightly better mileage (both were 4 speeds, lifted 4", running 33" tires). Average mileage was around 17 for the F250, and 14 for the Bronco. I get around 17 with the 360 in my 74.
With the 351 finely tuned, and a light throttle foot (this is the big one!!), it will get pretty decent mileage. Swapping will likely end up costing more than you save in the long run.
With the 351 finely tuned, and a light throttle foot (this is the big one!!), it will get pretty decent mileage. Swapping will likely end up costing more than you save in the long run.
Last edited by dadstan76; Sep 7, 2007 at 08:06 AM.
Logistics Pro
Joined: Aug 2003
Posts: 4,701
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Maybe you should hunt around and find a deal like kothlow said he got. That would make the swap worth it.
When I got my truck, I was kind of discusted that it had a 300. I thought I would swap it for a v8, but after 6 1/2 years of driving it, I love it. The PO did a bunch of performance mods to it, so I can't say how a stock one would be, but I get about 13-14 mpg with the motorcraft 2bbl carb and 4.10s with 36s. I am pretty happy with that
When I got my truck, I was kind of discusted that it had a 300. I thought I would swap it for a v8, but after 6 1/2 years of driving it, I love it. The PO did a bunch of performance mods to it, so I can't say how a stock one would be, but I get about 13-14 mpg with the motorcraft 2bbl carb and 4.10s with 36s. I am pretty happy with that
Senior User
Joined: Apr 2006
Posts: 156
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From: SE Missouri
Not a lot of people drive a 70's model ford truck for their fuel savings 
If you want to look at it from an effieciency standpoint, you might want to consider the savings in projected mpg vs. cost of putting it in. Be sure and keep in mind how many miles you would need to put on it for the install to pay for itself. However, for strictly entertainment purposes (hobby) you're welcome to do absolutely whatever you please. I will say that I've always liked my 77 F-150 with the 300, but I haven't driven anything else except my 2000 ford focus (I do drive it for the mpg) The most important thing though is that you be happy with it when you're done.
If you want to look at it from an effieciency standpoint, you might want to consider the savings in projected mpg vs. cost of putting it in. Be sure and keep in mind how many miles you would need to put on it for the install to pay for itself. However, for strictly entertainment purposes (hobby) you're welcome to do absolutely whatever you please. I will say that I've always liked my 77 F-150 with the 300, but I haven't driven anything else except my 2000 ford focus (I do drive it for the mpg) The most important thing though is that you be happy with it when you're done.
Posting Guru
Joined: Jan 2000
Posts: 1,899
Likes: 1
From: Cullman Alabama
I've had three of those 300's (4X4's) all gave me 13-15 Mpg.
The only reason against swapping (if thats what you want) is the ever abominable Exhaust manifold cracking.
I had to pay $400 to replace my last one (1993) and when I sold that truck I said to myself "no more of that" and went to V-8's with EFI.
I still have my 77, with it's 460 (bad Berings) and wish on every star at night for a 300 to replace this 460.
I had great luck with those 300's with the exception of those Exhaust manifolds.
I dont know where you'd ever find another Exhaust Manifold these days.
The only reason against swapping (if thats what you want) is the ever abominable Exhaust manifold cracking.
I had to pay $400 to replace my last one (1993) and when I sold that truck I said to myself "no more of that" and went to V-8's with EFI.
I still have my 77, with it's 460 (bad Berings) and wish on every star at night for a 300 to replace this 460.
I had great luck with those 300's with the exception of those Exhaust manifolds.
I dont know where you'd ever find another Exhaust Manifold these days.
More Turbo
Joined: Jul 2003
Posts: 629
Likes: 1
From: Grand Rapids, Michigan
Originally Posted by blockheadbob
I was wondering if anyone has a 300 Six in their truck? I am thinking of putting one in mine to replace my 351M as it gets 10 MPG and I cant justify driving it. Would a six give me noticably better mileage with my 350 axle gears?
Thanks,
Bob
Thanks,
Bob
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