SOme more 351m/400 Info.

[TexasNomad]

Just thought I would pass this along its a long read, if you want to read but at the bottom of the page it has a little interchange table..
Enjoy :wavey:
http://www.fordcobraengines.com/Modified%20History.htm#interchange

[UTfball68]

I've referenced that page several times myself Tex. I really like that chart.

[1985 Ford F-150]

Thats pretty neat there fellers so I guess that if ya want the most power available without havin to buy new pistons then ya find a very early 400 with the flat top pistons.

[Raptor22]

Long read but good info. Cool. :)

[1973 F-100 4x4]

Good information!! YelloThumbUp

[surewhynot]

Good info. Bookmarked.

[TexasNomad]

Well if its that good Tony maybe reps are deserved ;)
Or does it have to be 2 Cigarette kinda good to get reps :D

[surewhynot]

How many times do you want repped for it? :p

[TexasNomad]

...................................






































Yes...

[surewhynot]

I'll try harder then. :(

[surewhynot]

I've been tossing around thoughts on getting some more oomph outta the 400 in the scout

[TexasNomad]

Good cam and heads?

[TexasNomad]

I'll try harder then. :(

Aww come on Pig, u knew I luv ya :nana:

[surewhynot]

Yup, love you too pal. ;)

Cam, heads, straight up timing set.

[TexasNomad]

Do you know whats so great about the Aus heads?
I hear allot noise about them online but never really what makes them so much better then other brands?

[surewhynot]

I don't know much yet. Still learning 400's

[TexasNomad]

I don't much about them, but I know one thing I love them and I really really want one :D

[UTfball68]

Do you know whats so great about the Aus heads?
I hear allot noise about them online but never really what makes them so much better then other brands?



You wanna talk about heads...you wanna talk to JBrad or hollenjoe...both of which seem to be wizzes when it comes to 351M/400's.

[TexasNomad]

Really!
Will have to do that :)

[1985 Ford F-150]

I would also do flat top pistons with them heads and the timing set.

[UTfball68]

Really!
Will have to do that :)



Yeah...I think I can handle my own with mild to semi moderate builds...but when you want higher performance than that...you'll definitely want to talk to them. J pokes his head in here from time to time, but Joe still spends most his time 'over there'...so it might be best to send them a PM...and be sure to post whatever they tell you.

[TexasNomad]

Well I don't want a wild build, I just want a low turning monster :D

[UTfball68]

I would also do flat top pistons with them heads and the timing set.

I'd stay away from flat top until you get head work done...but that's just me. Yeah they raise compression, but I personally feel it's almost a 'waste' because you can't optimize what's available.

Well I don't want a wild build, I just want a low turning monster :D

As I've said several times before...go with the kind of build I always go with...with all brand new parts it cost me less than $3000 to attain 350hp/460tq.

[1985 Ford F-150]

What kinda head work ya talkin about?

[TexasNomad]

I'd stay away from flat top until you get head work done...but that's just me. Yeah they raise compression, but I personally feel it's almost a 'waste' because you can't optimize what's available.



As I've said several times before...go with the kind of build I always go with...with all brand new parts it cost me less than $3000 to attain 350hp/460tq.

I wonder what I could get out of a 400 :D

[UTfball68]

What kinda head work ya talkin about?

As I was told...it's a compression vs gas thing, and it's better to go with a dished piston with stock to mild build.

I wonder what I could get out of a 400 :D

I think J said he was expecting 425-450 rwhp, and you see what kinda work he put into his.

[1985 Ford F-150]

I know that but what kind of head work were ya talkin about? Port polish, springs, just havin em gone through, decked?

[TexasNomad]

As I was told...it's a compression vs gas thing, and it's better to go with a dished piston with stock to mild build.



I think J said he was expecting 425-450 rwhp, and you see what kinda work he put into his.

I can't remember if I asked you this or not, but what kind of heads are you running Ben?

[UTfball68]

I know that but what kind of head work were ya talkin about? Port polish, springs, just havin em gone through, decked?

To tell you the truth I don't really know, I've never messed with any head work. On another note octane related note, I went with the Comp XE262 cam and can run 91 octane...and Joe told me had I gone with the 256, I woulda had to run premium...no clue how that plays a roll. Like I said, when it comes to calculations, numbers and internal workings, I'm really not the guy to talk to. You wanna know about intakes, carbs, headers, sufficient cams...then I can help.

I can't remember if I asked you this or not, but what kind of heads are you running Ben?


Stock heads...been holdin up fine so far...they say the 351M/400 heads had a tendancy to crack...so I'm keeping my fingers crossed.

[Raptor22]

What kinda head work ya talkin about?

The kind that a prostitute does, duh... smilietease ;) :rofl2:

[TexasNomad]

Dude, please don't send my Innocent thread to the Lounge :p

[UTfball68]

The kind that a prostitute does, duh... smilietease ;) :rofl2:

Don't need one of those

Dude, please don't send my Innocent thread to the Lounge :p

I'll second that...good thread with good info...gotta spread the rep though...I'll get you later.


PS...glad to see in the short time I've been here you went from a 335 hater to wanting one.

[TexasNomad]

PS...glad to see in the short time I've been here you went from a 335 hater to wanting one.

Well I wasn't really hater but I was slowly turning in to one.
It's just every time I thought I learned some thing about these engines it turned out to be false and every thing I ever did hear about them was they were garbage...
Until you guys came around.:wavey:

[UTfball68]

Well that's what this forum is for. But as I've stated before, more often than not, there are better platforms to start with if you have specific kind of build in mind. But if you don't have the cash for a different engine, just want to boost some power, or like to maintain originality...these engines can become veeeeeeeery respectable.

[TexasNomad]

Well I look at it this way.
To get the kinda HP and TQ your getting out of your 351m I would have to stroke a 351w to a 393.
So really I can't see any reason for not just goting with a 351 like yours :D

[surewhynot]

With the junkyard availability, I can see the 335 series becoming more popular soon.

[UTfball68]

Well I look at it this way.
To get the kinda HP and TQ your getting out of your 351m I would have to stroke a 351w to a 393.
So really I can't see any reason for not just goting with a 351 like yours :D

Well...you gotta make it a 400 first...but nothing a $200 crank and another couple hundred in pistons can't take care of...or find a good junkyard/parts truck donor. That's the cheapest stroker kit I've found yet.

With the junkyard availability, I can see the 335 series becoming more popular soon.

I agree with this statement. Slowly but surely, I've noticed the aftermarket goody availability getting larger too...hopefully things like the Crane closing won't have a negative impact on that growth.

[TexasNomad]

Yeah once I get a little more better off (more money) i'm going to go out and find me a 400bolted to a c6 :D
Gonna pull it apart throw every thing but the block and crank away and start amassing parts :)

[1985 Ford F-150]

Yeah Im about the same Ben. Our premium is 91 so whats yours?

[UTfball68]

93 octane is premium at home and here at UT...91 is mid grade and the 87 or 89 is the cheap stuff.

[1985 Ford F-150]

Hmm 91 is premo and 89 and 87 are mid then we have 85 for cheap but it aint that mixed E85 garbage.

[TexasNomad]

I want some thing I can run 87 on :D i'm cheap :p

[1985 Ford F-150]

Thats what my dad keeps sayin to me its not a ton of money to fill it up either. usually 20 or 25 bucks every couple days if I drive alot.

[JBradley500]

Do you know whats so great about the Aus heads?
I hear allot noise about them online but never really what makes them so much better then other brands?

Aussie heads are just stock iron heads from a 302c from austrilia. They are just 2v heads with closed chambers. The closed chambers, with the correct pistons (.035-.055" of clearence), will create quench(turbulence actually) which does a better job atomizing the fuel and will let you run higher dynamic compression ratio without needing a better grade fuel, and still making more power. The stock 2 barrel cleveland heads are prone to detonation and that IMO is there biggest downfall.

[TexasNomad]

Aussie heads are just stock iron heads from a 302c from austrilia. They are just 2v heads with closed chambers. The closed chambers, with the correct pistons (.035-.055" of clearence), will create quench(turbulence actually) which does a better job atomizing the fuel and will let you run higher dynamic compression ratio without needing a better grade fuel, and still making more power. The stock 2 barrel cleveland heads are prone to detonation and that IMO is there biggest downfall.
thanks JB!
But kind of compressing are you running in your engine?
And any idea of what kinda of numbers it might be making?

[JBradley500]

9.7-9.8:1.. i changed to a different head gasket so i dont know for sure this time. i would expect an easy 425 but more wouldn't surprise me... not bad for a 400 with a hyd. cam, vacuum secondary carb and pump gas...

[TexasNomad]

That's what i'm wanting to build :D JB.

[havi]

Aussie heads also don't have the thermactor bump.

Also, it appears the stock 351M/400 intake has enough meat you could mill it out to accept a 4bbl.

I've been pondering this approach:

Offset grind 400 crank + .095 to late 300 rod pin size about $200
Set of reconditioned 300 rods about $250
Mill cheeks to width on a set of late 300 rods about $150
Use 351M pistons in your rebuild instead of 400's no additional cost

With a .040 overbore, this nets 429.6 cubic inches.
With stock heads this will give about an 8.9:1 compression ratio(scientific guess)
With stock heads milled .040, this gives about 9.2:1 compression ratio.

With stock bore this is right at 421 cubic inches.

[havi]

double post. But I'll add that I plan on going the TMI route for my 400, and the spare 351M block will be an experiment with the set-up I posted.

[hollenjoe]

Nice idea, the stock intake works as a 4bbl setup, i experimented on it and ran my 400 with it , it did a good job, Although i made a single big hole in it and made it to be a single plane small port manifold , it did a great job on low and mid rpm adn havent noticed the difference with my resently aquired weiand...

[flareside_thunder]

linky no worky...lotta good info.....makes me rethink wantin to sell my 80.....