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Old 03-08-2001, 08:06 PM
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Default can a 351M 400 make good power?

While looking for a 460 for my friends truck hefound a complete, running 351M 400 for $200. He hada '78 351M400 that was perty sick, actually I havent ever rode in a 351M equipedvehicle with any power. I thought I remembered reading that the origional engines had the cam timing retarted for emmissions reasons. I figure with 351 or 400 cubic inches there must be a way to get some good power from it. So, my questions are, 1) What can you do to a factory origional 351M engine to make some good power (and respectable fuel mileage, if possiable). I was thinking of a new comp Cams 260 cam and maby a 600 Edelbrock. We will probally keep the origional 2 barrel at first though. How do you tell a 351 from a 400? Its my understanding that the only big diffrence is a half inch in the stroke. Is there any external diffrences to tell them apart?
Thanks,
Mike

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Old 03-08-2001, 09:35 PM
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Default Re: can a 351M 400 make good power?

Personally, I would keep looking for a 429/460. Yes you can build a 351m/400. But parts are more readily available for the 429/460. And they have so much more potential.

It's hard to give advice on how to build this engine without knowing how you plan on using it, and a few things about the vehicle you are installing it in. Are you looking for a torque monster? Or are you looking for a high rpm horsepower machine? It'll cost you far more to build a decent 351m/400 than it would if you built a Lima (429/460).

'72 Commando. 360 TH400 SOA 33" Swampers
'78 F250 SuperCab 460 C6 NP205 Dana 60's 33's
'75 Dodge Powerwagon 440 NP435 NP203 Dana 44&60 33's, Western plow
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Old 03-09-2001, 04:17 PM
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Default Re: can a 351M 400 make good power?

The engine is going in a 3/4 ton pickup with a straight 6. It is his daily driver and might see a lift and 35's down the road. It has 33x12.50's now and I *think* 4.11 rear. The I-6 is a dog! For what he wants, if it were a chevrolet, I would probally recomend a stock 350 (with 1.94 intake valves, not the 1.74 2 barrel jobs) and a comp cams 260 camshaft, maby a 268 if he has 4.11's for sure. The trouble seems to be that I havent found a 351M that seems to run like a chevy 350sb. Being of the same bore and nearly identical stroke, I would think that the 351M has the same potential as a sbc 350, I figure they are a victom of emmisions controls. For a reference, he seems to think my short wheel base 4x4 chevy runs real good (I dont, it runs decent). I have a '76 model 350 completely stock (has 1.72 intake valves, had a 2 barrel) except for an alumnium intake (GM) and an edelbrock 600 carb. I have 3.42 gears, 33x12.50's, and a 4 speed stick shift. He (we) are working on a budget and found a 351M400 for 2 or 3 hundred (dont remember) that is complete and in good running order, he said he doesnt want another like he had (he already had a sick 351M400).
Thanks,
Mike

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Old 03-09-2001, 06:34 PM
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Default Re: can a 351M 400 make good power?

With the application I would definitely hold out for a 429/460. Look for a 68-71 first. Casting number on block will start with a C8 for 68, C9 for 69, DO for 70, D1 for 71 and so forth. With the early 429/460's you get a decent set of heads, plus the early engines didn't have a dished piston. Compression on these engines is somewhere in the 9:5.1 to 10:5.1, this is just off the top of my head.

I'd run a mild cam with duration somewhere in the range you mentioned 260 to 280 degrees. I'd also recommend a split profile cam favoring more lift on the exhaust side. Top it off with a dual plane manifold like a performer and a 750 cfm carb. Throw on a set of headers, good ignition and you'll have a strong running 460 that won't cost an arm and a leg.

If you want to get a little more involved the exhaust ports of the 429/460's have a hump that can be removed for an additional 10 horses or so. But if you plan on getting wild, then we're talking roller rockers, big cams, etc...

You can build a mild 460 that will make gobs of torque for around 2k. A 351m/400 would be a complete waste of time and money. If you do go the 351 route, build a windsor. I personally like clevelands but they can be spendy and the aftermarket for them isn't there like the windsor's.

'72 Commando. 360 TH400 SOA 33" Swampers
'78 F250 SuperCab 460 C6 NP205 Dana 60's 33's
'75 Dodge Powerwagon 440 NP435 NP203 Dana 44&60 33's, Western plow
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Old 03-12-2001, 11:13 AM
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Default Re: can a 351M 400 make good power?

Heck yeah they can make power. Slap on a fourbarrel (i got a edelbrock 1406), an intake (performer), throw in a new cam, and adjust the timeing, and you might see a little power. Then do the exhaust with headers, duals, and good mufflers, and you have lots of power. Never heard of anyone getting decent milage, but i know lots of people that have the 351M or 400M that can haul ass and go fast. They did an article in ofroad online last month on the engine, check it out.

93 F250 7.3 Diesel, 4 inch tuff country lift, 35 inch Wild Country's, What muffler??
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Old 03-15-2001, 09:27 AM
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Default Re: can a 351M 400 make good power?

I have 2 351M one in each of my broncos and putting a 514 in one then redoing the 351M with 400 crank etc... I hear they only used the inerds for emission reasons so if it is converted back to a 400 it will make quite a big difference... check out this link

http://www.projectbronco.com/Technic...e_build_up.htm


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Old 03-15-2001, 12:12 PM
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Default Re: can a 351M 400 make good power?

Try for the 429/460. But hell yeah they can make some power. No matter what anybody says.

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