I know it seems the 460 has tons of more aftermarket products available than the 400m. I have a 460 in my truck now and it needs to be rebuilt and I am thinking about replacing it with a 400m. The truck will be used for driving long distances and towing in the mountains. Also some hot rodding and mud boggin on the weekends. I like the idea of a longer stroke on 400m vs the stroke on the 460. I know a 460 can be built for alot of HP and torque but thats way up in the high fives to sixes in the RPM range. What do you think woudl be most efficiant? and woudl build the most torque at LOW RPM's..

Also what are the numbers of torque on the 460 vs the 400m @ about 3k to 4k on both engines with the same mods?

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1985 "Cowboy Cadillac" Ford F-250 4x4, Granny 4-speed, 4:10
Gears, 460 with Holley 750cfm 4-barrel Carb, Custom Painted Block (Ford Dark Blue), Rebuilt Transfer Case, BFG Trac-Edges, Tachometer, Kenwood CD Player and Pioneer Speakers, 27" cherry bombs dualed out each side with 2 1/2 inch pipe, NAPA Premium Clutch, NAPA Premium timing Chain, Gooseneck Ball, Hitch Reciever, Whistler 400 radar detector!

"When in Doubt GAS it"

 

Take a look at the Hot Rod article on the 400 build up they did.

http://home.earthlink.net/~tcrocker/400.html

Huge torque down low.

 

if your gonna be towing in the mountains, keep the big block. the 400 is way underpowered and more expensive to build, and there's less parts available on the aftermarket. you need hp for towing in the mountains, not tq. tq gets your vehicle moving and hp keeps it moving. keep the big block!!!!!!!!!

 

hey keep the 460, even a basically stock 460 will out power a modified 400 m

 

thnx for the info guys!

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1985 "Cowboy Cadillac" Ford F-250 4x4, Granny 4-speed, 4:10 Gears, 460 with Holley 750cfm 4-barrel Carb, Custom Painted Block (Ford Dark Blue), Rebuilt Transfer Case, BFG Trac-Edges, Tachometer, Kenwood CD Player and Pioneer Speakers, 27" cherry bombs dualed out each side with 2 1/2 inch pipe, NAPA Premium Clutch, NAPA Premium timing Chain, Gooseneck Ball, Hitch Reciever, Whistler 400 radar detector!

"When in Doubt GAS it"

 

> hey keep the
>460, even a basically stock
>460 will out power a
>modified 400 m

You might want to read the Hot Rod article before you make that claim. I don't think there were many stock 460s turning out 382 hp and 456# of torque. That was with a 2V and cast iron manifolds. I'm not knocking the 460 but a warmed up 400 is a very potent engine.

 

I dont know what they did to get 380 out of that motor, but my brother and i put one togetherwith flattops, stock heads that i ported myself, edelbrock preformer, intake, nice cam, headers, and a holley 600. my stock 460 with stock untouched heads,cam,intake,manifolds,every thing was stock save the holley on top and both were in 78 broncos and mine was a lot more powerful than his hands down. this was the reason i wrote what i did i didn't figure he wanted to go as extreme as what hotrod mag did and if he was going to spend that kind of money why not put it back into his 460 power would be a lot more than that 400. that is what i was trying to say. all things being equal, putting the same amount of money into each motor using as similar of parts as possible the 460 would bury the 400

 

[font size="1" color="#FF0000"]LAST EDITED ON 05-Mar-01 AT 10:34 AM (EST)[/font][p]I agree with Bill. My built 400 will flat out whoop any stock 460. I don't care what some of those other people say, the 400's can make gobs torque and hp. Minds living proof. But keep the 460. There no replacement for displacement. (or something like that). I myself will someday put a 429 in. But that's only for mudboggs.

 

maybe your built 400 but what was done to it? Imagine if you did to a 460 what you did to your 400 it would really pull. trust me i've rebuilt both and there is no comparison, a cammed 460 will destroy a cammed 400, add an intake, the 460 will tear it up, add more compression to each the 460 will tear it up this is my point for the work and money it's not worth building a 400 if you have a 460>>>

 

I wouldn't advocate to anyone pulling a 460 to put in a 400. There's just no good reason to since the additional torque you might get wouldn't offset the cost of the build/swap. Take the money and put it in the 460 and you'll have close to the same torque and probably more hp.

But you said a stock 460 will out do a built 400 and that's simply not the case if it's built right.

 

hey man, with that 400m, you can get lots of power, as in the case of of the hot rod article that people are mentioning. but if you read a couple of issues later, they built a low compression 460(around 8.8:1 i think) basically the same motor that i am building myself, and made 431 hp and 494 lb/ft of torque. and with what i have in the motor its about $2000. so you may even be able to do it for a little less, cuz i bought everything piece by piece except for the bottom end of the block. but good luck, and keep the 460, i say.
mike

 

[font size="1" color="#FF0000"]LAST EDITED ON 06-Mar-01 AT 09:55 PM (EST)[/font][p][font size="1" color="#FF0000"]LAST EDITED ON 06-Mar-01 AT 09:52 PM (EST)[/font]

I did'nt say that a beefed 400 would beat a beefed 460. I said *MY* beefed would beat any *STOCK* 460. I also said to *KEEP* the 460. I myself would never go from a 460 to a 400. But the 400 has a bad rep. I did want to build a 429 but the money said otherwise. (You know how that can be.) So I rebuilt my 400 under 2,000 and i'm happy. It all depends on how you build it.

 

I respect all forms of Ford power (except 4 cyls.). The 400 might have a bad rep for power (from the factory) but you can't knock its reliability. The 460 would be my preference but if a truck is equipped with a 351M/400 why not stick with that as it is a direct drop in (you already have the components to do so).

Fordy

1978 F-250, 351M 4spd.

 

Original Post states that he has a 460 in the truck now.
The 460 is already there, waiting for some TLC.

It's better to have and not need than to need and not have.



Dre'
1978 F-150, 460ci(750cfm,Edelbrock Performer,Dynomax Ceramic Coated headers,etc.)Auto-C6,3:70.1 - 9" Posi.

 

My oppinion is that both are great engines. I have a 400 and a friend has a 460 from a 1976 Lincoln in his 78 F-250. The 460 is more powerful but does get worse gas mileage. I think that either engine or any engine can be made to be super powerful if enough time and money is put into it.

Vern