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Tractor Pulling Discussion Board

Re: Farmall M Carb

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Posted by LarryM on September 19, 2012 at 18:11:31 from (

In Reply to: Farmall M Carb posted by Dan in TN on September 18, 2012 at 17:49:25:

I have a C-281 that was mildly stuck when I bought it and it just has the old Tractor Supply pistons that makes 67 hp at 540. I believe those pistons make it an 8:1 comprerssion ratio engine. It made 66 with a size 33 venturi but when I tried a size 36 it gave me another horse. The other things that I did was polished the intakes ports, multi angle valve job, port matched the gaskets, electronic ignition, a 450 gas manifold, and the carb is off a C-281 power unit so it looks like an M carb with the choke on the outside versus inside like a Super M. I am running 93 octane with 10% ethanol. Going to a better fuel gave me 3-4 hp even with the lower ompression engine. A size 29 is what the 706 carb had in it. One last note... I have a really good governor and cannot pull it down to 70 hp when I go below 540 PTO rpm.


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