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Super M Head part #

D

Deano4863

Member
I have a head off of a super M. Date code is:12/16/X. Under the valve cover are the #'s 6336 DE. On the side of the head is: 8704 DA.
I can't find any reference to these #'s. All I can find is 8060 and 8574 #'s. Is this an ok head? Does it have any inherent problems for a general rebuild?
 
The 8704 and 6336 head is a kerosene head, you will not have a problem rebuilding the head. The only 'problem' and it may not be is that its a lower compression head then the 8060 and 8574. Those heads are gas. This will result in a lower compression and alittle less power in the end.

Andrew
 
Those head numbers were used for the same aplication. Depending on the tractor model or year made, they were used for both kerosene and distillate fuel. Your SM may have a suffix letter after the engine serial # for fuel type if it came with the head posted about. 8574 DB and 8060 DC would be the gasoline heads that came on a SM. All other things equal the 6336 DE head will give you lower compression than the gasoline heads.
 
The casting date code shows it to be a late 1952 head. That date code matches the rest of the date codes on the tractor. The tractor does not have the extra starting tank or distilate manifold. Would IH have put that head on from the factory or do you suppose it was replaced.

Next question is what does "low compression mean? How much lower in psi? If I'm going to spend the money for a rebuild can this head be milled to increase the compression? and if so how much.
Will it accomodate the stepped head pistons? It has flat tops in it now.
 
You will not have a problem running a domed piston with that head. The term low compression is used to described a head that is designed to burn kero or distilate fuels. You can mill the head down to increase compression but you will need to take it down quite a bit to get even get close to a stock high compression head. The diffrenence in compression is, the low compression will have around 90 psi while the high compression gas will have around 130psi. As D said check your tag for a suffix it could have been ordered like that from factory. If your not planning on pulling or heavy tillage then that head will be fine. What are you planning on doing with that Super M?



Andrew
 
you can't mill enough off to make any difference. you need to find a 8060 or a 8574 head unless you want a super m with ten less horsepower than everyone elses. ps, it would be hard to locate valves for a kerosine head, they are shorter yet than the valves for a disstilate head.
kerosine engine compression would be around seventy pounds.
 
Common for gas manifolds to be installed at a later time on distillate and kerosene engines. If all associated parts for fuels other than gasoline are missing it could be impossible to tell what fuel the tractor came with. Unless the serial number of tractor or engine has the letter A after the #, or maybe a B. On 264 engines the head # you have was supposed to be used for distillate fuel. It will have roughly 1 to 1.5 point lower compression ratio compared to the gas head.
I would say your head could be original to a SM tractor serial # 21000 or higher for a farmall or 501500 and higher for a louisville one. Could be a replacement head also.
Another thing that may or may not be a tip is the carburetor #. 356984 for gas and 357231 for other fuel types.
 
Serial # Tag is:SM F-1543 AJ. This shows it to be a early 52. Date codes on rest of tractor show to be Jan-Feb X-1952. The head is almost 10 months older that the rest of the tractor.
 
The letter A in the serial # shows your tractor started out as a distillate fuel model. Your tractor was assembled in april of 1952. Date code you posted on head shows it was cast 12-16-52 or after the tractor was built. so it was replaced sometime. Or did you mean 2-16-52 on the head. It is the correct head number for how your tractor was originaly equiped.
 
Thanks, I really appreciate the info. I believe I'll start looking for a gas head. If I'm going to spend the money I want the most HP for the buck. Does this distilate head have any value? I'm going to check the part # on the carb next to see what it is. How is the distilate carb different than the gas carb?
 
Thanks, I really appreciate the info. I believe I'll start looking for a gas head. If I'm going to spend the money I want the most HP for the buck. Does this distilate head have any value? I'm going to check the part # on the carb next to see what it is. How is the distilate carb different than the gas carb?
 
I believe I'll start looking for a gas head. If I'm going to spend the money I want the most HP for the buck. Does this distilate head have any value? I'm going to check the part # on the carb next to see what it is. How is the distilate carb different than the gas carb?
Click to expand...
Since you are rebuilding anyway, you could use the head you have and order a rebuild kit with firecrater or domed pistons. That will get your compression up.
Does your low compression head have any value? Yes, some. But everybody wants it about as badly as do you. That ought to give you some idea......
Don't worry about the carb. Very little difference (if any) as far as making power on gasoline.
mike
 
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