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Farmall400 with 61 hp

Yea Ok i can believe that as my S/MTA puts out 60 and there is one that puts out a lot more down the road and is used everyday on a dairy farm , now is it stock just what do you want to call stock ????? mine has M&W pistons a M&W gov. a tweaked dist and slight carb work. Vernon's S/MTA has Stock pistons for a 450 and stock manifold for a 450 and stock cam from a 450 and a Stock 450 head , they are all stock parts and they all fit or bolt on so i guess you can call it stock.
 
You asked what we thought of the guy, not whether what he said was a fable or true, so I say the statements may be disingenuis, but I still can't say anything bad about the person.
 
Depends on what you want to call stock. Thats in the area of what a 400 with 4-1/8 bore firecrater pistons in it could make at sea level. some a little more.
If running a higher grade gas, timed for max power and in great tune it can with the 1/8 over stock pistons.
But unless you see tractors run on the same dino with the same person calculating readings the same every time I wouldn't worry about comparing power.
 
the guy is a good friend of mine ...one of the best guys ever and I like him a lot.... Like I told him... I don't think you are lying.... It's just hard to believe :D


I just wanted to know what you thought of a stock 400 with 60 hp? He says it's stock. I take that to mean the stuff and size it was built with... you can tune it all you want.
 
I'd think the guy has a 400 about as peppy as mine.
My 400 likely had a 450 kit put in it back in the
80s before i bought it; it has more hp than my 3010
judging by how they each run the forage harvestor;
so I'd say 61 is reasonable.
 
10-12 extra HP is easy enough to get out of a "factory" engine.
"Stock" meaning no stroking of the crank, over size pistons running in the block with no sleeves, or major valve or head work.

As mentioned previously, slightly larger pistons & sleeves, cams, carbs, that were all available through dealers originally, and later aftermarket companies like Heisler, M & W etc.
 
They are essentially the same. In the beginning I don't think there were any PTO's, now there aren't any belt pulleys. Both driven off the transmission.
 
I would say he should try it with a different operator on the dyno or a different dyno. HP has to be read at the rpm dyno is set to read at. Lots of guys pull them down, torque rises but rpm is dropping off faster than torque is rising so therefore producing less hp than operator claims.
 
In about 1966 my dad bought a used 400 that was just overhauled by the dealer with Fire-Crator pistons. I think it pulled 61 HP on the dyno. I still have the 400 and it has only 1300 hours since then. It still might make 61 HP. But is it stock with IH Fire-Crator pistons? Probably almost no 400s left with the original factory pistons. Al
 
I know where there's a 400 that the previous owner claimed 65HP on the dyno.

When he bought it, it didn't have enough power to suit his needs, so he took it back and complained. They put in 5000ft pistons.

That still wasn't enough so he took it back and complained some more. They put in 8000ft pistons.

Since those are all "stock" parts that could be ordered from the factory, technically, the tractor is "stock."

I do know that it plays with a 3-14 plow, where a Super M has a little trouble.

What the heck would you need 65HP for in 1955?
 
my super m was 63 pto with loose pistons, 4 1/8 high altitude with gas head also depends on dyno and operator
 
I think there was a need for it. My Dad had a M that was improved. The implement talked him into a 400 and it couldn"t pull what the M did. He souped the 400 up when they went to the over bore. He said it took the 560 to be able to chop corn silage without having to push the clutch in. We ran a 560,460, 400, 240 and a 230 on 300 acres from the 50"s until 73 when he bought a 766 diesel. I think he had the 560 souped up also as he could pull 4-16 semi mounted plow in the hills with clay. It took 1000lbs to keep the front down.
 
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