400m?
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New User
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400m?
I know there is allot of thread on these 400m motor but here is my question, I have a 1977 400m 2bbl 4x4 f250 camper special, runs grate but going up hills with a loud it lacks HP!.....so I was thinking of adding a cam, 4bbl, intake, headers and dual exhaust?? Or just add a "460" what would make more sense as far as the cost to the reward??????
Lead Driver
Joined: Jun 2006
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From: Near Yosemite CA
You will get many opinions on both sides, but if you can, I would go to the 460, nothing against the 351M/400 as I have one in my 77 (thank you smog laws) they are a decent motor, however, the 460 is a beast, and there is no replacement for displacement!
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Joined: Oct 2007
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I know there is allot of thread on these 400m motor but here is my question, I have a 1977 400m 2bbl 4x4 f250 camper special, runs grate but going up hills with a loud it lacks HP!.....so I was thinking of adding a cam, 4bbl, intake, headers and dual exhaust?? Or just add a "460" what would make more sense as far as the cost to the reward??????
The other guys are right as far as the 460 goes
If you don't want to spend alot of $$ I'd swap in a 1971 400 timing chain set, it made a noticeable difference on my 351M
Posting Guru
Joined: Nov 2007
Posts: 1,305
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From: Montgomery, IL
putting one of these on it with the timing set to 0 degrees advanced will help greatly:
Search Results for 351m timing chain - SummitRacing.com
Search Results for 351m timing chain - SummitRacing.com
Laughing Gas
Joined: Aug 2007
Posts: 1,107
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From: Spokane, WA
You could probably breathe a lot of life into your 400 for a lot of the cost to get yourself a 460 donor engine. Go with a staight up timing set, good cam, intake (Edelbrock is a good choice for stock displacement...Weiand would be good if you stroked it out bigger), 4bbl carb, and headers, and your 400 would wake right up.
Also, depending on what year 460 you're talking about, they weren't all fire breathers from the factory either, so you'd have to modify it as well. Yes, displacement helps, but if you're choosing between a factory choked off 400, and a facotry choked off 460 when you already have the 400, it'd be cheaper to just modify the 400 for good gains.
I'm a fan of both engines, but for bang for the buck (including cost of getting the 460 and possibly having to modify it anyway depending on year built), I'd stick to the 400 since you have it already. Now, if you have the money, and want to go nuts, then either plant would be hunky dory.
Also, depending on what year 460 you're talking about, they weren't all fire breathers from the factory either, so you'd have to modify it as well. Yes, displacement helps, but if you're choosing between a factory choked off 400, and a facotry choked off 460 when you already have the 400, it'd be cheaper to just modify the 400 for good gains.
I'm a fan of both engines, but for bang for the buck (including cost of getting the 460 and possibly having to modify it anyway depending on year built), I'd stick to the 400 since you have it already. Now, if you have the money, and want to go nuts, then either plant would be hunky dory.
Senior User
Joined: Jan 2010
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From: Great Falls, MT
As much I agree with this statment (i've been around and in drag racing since I remember), dare to be different, keep the 400, make it exciting, something that ppl look at and think "wow, he's good"
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Posting Guru
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From: Wingo, Ky
Almost everybody does the 460 swap. Upgrade the 400 and be a little different. They are little beasts waitin to be unleashed. Just my opinion.
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Post Fiend
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Funny fellas.
There is no such thing as a 400M. Only the 351"M" was designated this way. Its designation was to identify it as a 335 series engine, and not to be cornfused with any of the other engines that shared the same displacement.
Folks want to be different and use the 400, but there is a reason why the 460 swap is so popular.
Probably a similar reason why the 400 is no longer being produced, and has mong been discontinued.
Looking to unleash a real beast? Its sitting under a set of 460 valve covers. Making power with one is as easy as it gets, and dollar for dollar a better deal than the smaller engine.
Can the 335 series engine work? Sure it can but is the return worth the investment?
There is no such thing as a 400M. Only the 351"M" was designated this way. Its designation was to identify it as a 335 series engine, and not to be cornfused with any of the other engines that shared the same displacement.
Folks want to be different and use the 400, but there is a reason why the 460 swap is so popular.
Probably a similar reason why the 400 is no longer being produced, and has mong been discontinued.
Looking to unleash a real beast? Its sitting under a set of 460 valve covers. Making power with one is as easy as it gets, and dollar for dollar a better deal than the smaller engine.
Can the 335 series engine work? Sure it can but is the return worth the investment?
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Man hard choice!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !
Elder User
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From: Hattiesburg, MS
Well, the 400 was discontinued because it cost more to manufacture than the "Windsor" series engines. More specifically, the O2 sensor is what finally killed it. Emissions regulations would require the O2 sensor to be placed BEFORE the injected air. The air injection was built into the 335 series engines, making this impossible. The "Windsor" engines used external tubes for air injection. This made them much easier to adapt to the new emission standards.
So, the 335 was more expensive to begin with. And would cost even MORE to completely retool the emissions junk. So, which one do you think the bean counters over at Ford decided to continue producing?
So, the 335 was more expensive to begin with. And would cost even MORE to completely retool the emissions junk. So, which one do you think the bean counters over at Ford decided to continue producing?