Ford Bronco Zone Early Bronco Classic FullSize Broncos: 400m rebuild - Ford Bronco Zone Early Bronco Classic FullSize Broncos

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400m rebuild what to do

#1 Little Giant

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Posted 28 July 2008 - 01:19 PM

I am looking to replace my 351m and rebuild a 400m. How much power can I get out of a 400m and what parts do I need to get the most out of it that I can. I am looking for something good in mud.

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#2 bob75cj

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Posted 28 July 2008 - 01:31 PM

Only thing needed to turn your 351 into a 400 is con rods, all other parts are the same including pistons. 4 bbl intake, bigger cam and a good 4bbl carb will really wake up your 351. Not much difference fuel wise between 351 and 400. Bigger displacement most always = more power/torque. I built a 351m about 20 yrs ago. 10.5 to 1 pistons, huge cam and 780 d/feed double pump holley with off road kit. Ran like a scalded dog. Miss the power, mileage wasn't a whole lot worse than stock.

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#3 Little Giant

It's Only Money, Right?

Group: Members
Posts: 35
Joined: 14-October 07
Gender:Male
Location:Lake Jackson TX
Interests:Building my 78 Ford Bronco for some hard core mud. Im in the US. Marines right now working on CH-46 Sea Knight in Camp Pendleton Ca.

Posted 28 July 2008 - 01:39 PM

Well I have a brand new edelbrock carb and intake to go on it, should I bore the cylinders out?

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#4 swampthing

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Interests:I drive an 85 bronco with 4 inch (soon to be 6 inch lift) it has a worked 302, msd ignition components, ford performance racing cam and lifters, ford racing intake, holley dual feed mech. secondady carb, custom dual exhaust, 2 1/2 inch dynomax oval bullit race mufflers with hollowed cats, <a style='text-decoration: none; border-bottom: 3px double;' href="http://www.serverlogic3.com/lm/rtl3.asp?si=24&k=5%20point%20harness" onmouseover="window.status='5 point harness'; return true;" onmouseout="window.status=''; return true;">5 point harness</a>, supertach, water temp and oil pressure guages.

Posted 28 July 2008 - 02:21 PM

correction, you need a new crank and pistons to convert your 351 into a 400 the rods are the only things that are the same between both

currently: 78 bronco 400M c6 np205 d44 9 inch cut wells 38 inch tsls no interior soft top summit headers dual flowtech exhaust

built : 85 bronco, locked rear 302 fpr intake cam push rods and lifters, comp cam springs, ported heads and intake 4 inch lift c6 33 inch tsls

78 bronco 400M jasper open front and rear S/A 9 inch 4 inch lift 36 inch kelly safaris holley red holley regulator

88 ford F250 stock 302 EFI AOD with shift kit. d60 back 4.11 d44 TTB front 4.11 36 inch goodyear wrangler R/T II's