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Old 12-03-2002, 06:43 PM
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Unhappy question on rebuilding a 400m

I have a 400 from a 1977 f-250, I broke it down and had it bored .080 over and had a 3 angle valve job done on the heads, but i am looking for 400 hp or better. how can I achieve this with this motor? I have money to spend just not the knowledge of this particular engine. Any help would be appriciated- thanks

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Old 12-03-2002, 06:47 PM
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this motor is a mid range torque motor, don't try to rev it like a small block. use a cam that makes its power below 5500 rpm, also be aware these motors are very hard on valve stems and guides if the wrong length pushrods are used on an aftermarket cam.
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Old 12-03-2002, 07:47 PM
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[quote]Originally posted by BOBCRMAN@aol.com:
<strong>this motor is a mid range torque motor, don't try to rev it like a small block. use a cam that makes its power below 5500 rpm, also be aware these motors are very hard on valve stems and guides if the wrong length pushrods are used on an aftermarket cam.</strong><hr></blockquote>
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Old 12-03-2002, 07:48 PM
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[quote]Originally posted by stangfiend:
[QB][/QB]<hr></blockquote>

what would you suggest, I was going to go with crane for the entire setup?
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Old 12-03-2002, 08:02 PM
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Anything bigger than a 268 HE style cam is too much cam since you can't go much above 5500. Stay with the big RV style cams sold specifically for this engine and you won't go wrong, don't assume that a dual plane intake is good either. These are mid range engines and need just as much carb and intake as a healthy 427 Chevy, they just can't use too big a cam. Have a look at my <a href="http://hotrodders.com/cgibin/album/album.pl?album=00001837" target="_blank">400</a>, this one puts out close to 400HP depending on exhaust.
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Old 12-03-2002, 08:04 PM
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What heads are you using? The D5AE (1975) are the prefered head due to thicker castings (same ports).
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Old 12-03-2002, 08:11 PM
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Here's a tech article on the 351M/400. I didn't read it, cause I ditched my 351M in favor of a 429.

<a href="http://www.projectbronco.com/Technical_Articles/351m400_performance_build_up.htm" target="_blank">351M/400 Tech Article</a>
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Old 12-03-2002, 08:54 PM
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[quote]Originally posted by 4 Jaw Chuck:
<strong>What heads are you using? The D5AE (1975) are the prefered head due to thicker castings (same ports).</strong><hr></blockquote>
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Old 12-03-2002, 08:56 PM
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I'm using the stock heads, I was told they were 351 heads but haven't got thr numbers to run them yet
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Old 12-03-2002, 10:07 PM
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The casting number is on the head under the valve covers, The D4AE is good too. 400 and 351M heads are the same in all years.

Cool link BBB!

[ December 04, 2002: Message edited by: 4 Jaw Chuck ]</p>
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