460 swap mpg
Senior User
Joined: Sep 2009
Posts: 384
Likes: 1
There are a lot of variables to concider in that though. I'm building my 460 with top notch parts and then keeping a mild cam and carb to keep the air flow and fuel to a min to still getting good mpg. I'm shooting for 16-17mpg. A stock well tuned 460 will do 13-14mpg acording to the guys in the 460 forum.
I average 13.5mpg with my 360FE
I average 13.5mpg with my 360FE
Logistics Pro
Joined: Jun 2003
Posts: 3,923
Likes: 272
A 40 yr. old, 4,000 lb. cinder block shaped vehicle will never get good gas mileage, especially if it's got a 460 under the hood. I don't ever plan to calculate my mileage since I did the 460 swap, it might put me into shock 
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Cargo Master
Joined: Feb 2003
Posts: 2,341
Likes: 5
From: Sacramento
It has OK smiles per gallon. The big reason for yanking it out in a few months is to make the smiles bigger. The engine that's in my avatar is what's going in there....somehow. Being diesel, I'm hoping for 17mpg in town, and maybe 20 on the hiway...as long as I dont romp on it too much.
Senior User
Joined: Sep 2009
Posts: 384
Likes: 1
I think with the torque you will be getting from that thing will alowe for some seriously high ratio gears to add to your mpgs. I kinda want to do a swap like that and go all bio just because I can but i'm afraid of the expence of a motor like that.
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Post Fiend
Joined: Nov 2000
Posts: 6,060
Likes: 7
From: Glendale Arizona
I was getting an average of 16 with the 472 EFI. This was in a short bed 64 with 2.75 rear gears.
Anything over 10 in a carburetor equipped 460 is a bonus.
Garbz
Anything over 10 in a carburetor equipped 460 is a bonus.
Garbz
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Cargo Master
Joined: Feb 2003
Posts: 2,341
Likes: 5
From: Sacramento
The highest gears I could find for a Sterling is 3.08, which shouldnt be too bad, and the Allison isnt an overdrive. No possible way a 9" would hold up, so I'm getting a Sterling 10.25 to match the big F250 rotors I got for the front. That's a bit off topic. Back to 460s shall we?
Logistics Pro
Joined: Nov 2003
Posts: 4,371
Likes: 7
From: PA
When doing a 460 swap as jedi out it smiles per gallon from what I gathered from different people with the 460 swaps they get 8 to 13 mpg average but you have to consider the build how well its tuned gears and how much of a lead foot you have but that seems to be the basic average for the 460's
Logistics Pro
Joined: Jun 2003
Posts: 3,923
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The highest gears I could find for a Sterling is 3.08, which shouldnt be too bad, and the Allison isnt an overdrive. No possible way a 9" would hold up, so I'm getting a Sterling 10.25 to match the big F250 rotors I got for the front. That's a bit off topic. Back to 460s shall we?
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
I get smiles per gallon reading some claims made on this site. Thing is when swapping around trannys, tires, rears, speedo gears don't get corrected, or canucks buying a different measure of gas and using US calculations to figure it.
These big azz bricks don't cut the wind they plow it.
John
These big azz bricks don't cut the wind they plow it.
John
Logistics Pro
Joined: Jun 2003
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My experience is that you'll run into traction problems long before anything breaks. I can roast my tires if I mash the gas at 45 mph. I get third gear chirps and a little bark sideways going into third at 85 mph.