HP on a 400m

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Sep 4, 2007 | 09:11 AM

mikeismadness

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From: laporte in

HP on a 400m

Tryin to get some decent horses out of a 79 400m engine in my 79 F250 4WD. Trucks gonna be a mudidn truck pretty much. Readin around on the net and from the factory the truck ahs 159 hp at 3800 rpm and 276 ft lbs torque at 2000 rpm. I want atleast 300 hp and 350 ft lbs of torque. I'm goin with new flow tech headers and either running open headers or gettin flowmasters or stacks. Any idea on how to squeeze some power out of this b/c i can't find too many performance parts in jegs or summit

Sep 4, 2007 | 09:14 AM

greythorn3

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From: Anchorage Alaska

hmm

why not just put a 460 in it?

ray

Sep 4, 2007 | 09:18 AM

mikeismadness

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From: laporte in

Well, im tryin not to take the motor out, but a 460 is definetly the way to go.

Sep 4, 2007 | 01:05 PM

Mil1ion

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You need the 335 engine series forum (for 351M & 400 engine discussion) or the Engine performance forum.

https://www.ford-trucks.com/forums/forum54/

https://www.ford-trucks.com/forums/forum47/

Btw, NO M after 400 .. Just 400

M goes after 351 as in 351M

Maybe read this?

https://www.ford-trucks.com/article/...00_Engine.html

This forum is more about the 73-79 trucks differences than other years.

Sep 4, 2007 | 03:46 PM

mikeismadness

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From: laporte in

oh, i didnt know it didn thave an m, thanks for the links

Sep 4, 2007 | 07:37 PM

MBDiagMan

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From: NE Texas

Once you do something to get a decent compression ratio, the rest is easy.

Sep 4, 2007 | 10:34 PM

unrulee

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From: Coal Country, ND

With a 4 barrel, intake, headers, a decent cam, and straight up cam timing 300 horse is possible. There have been many people (myself included) that have used this recipe with great results. The 400 can be made into a great performing engine.