Farmall h up grades

DanH

Member
Looking to up grade my farmall h for some more horsepower. Thinking about using a super h carburator and a super h intake manifold not sure to use a regular manifold or a lp manifold. Should I also up grade to a different cylinder head? Any of your input will greatly be appreciated

Thanks Dan.
 
If pulling in a stck class, the carb is so different that you will be noticed immediately. The horse power is going to come from cubic inches (bigger bore and pistons using a thin wall sleeve) and higher compression. A 350 head and camshaft, fire crater or pop-up pistons will be a game changer.
 
Switching to an SH carb and manifold will give virtually no more power than stock. And if you pull in stock class you will be disqualified anyway as JimN mentions.

An LP manifold may help a bit. But for any significant power increase be looking for a higher compression head and pistons.
 
I do not know if you are tractor pulling or not.

Increased compression is number one way to gain free HP, fire crater pistons.
 

A bigger carburetor will do nothing for you unless you make some serious mods to the engine first. In fact, the bigger carb might be a hindrance.
 
Didn't say what model. If engine is in good shape and good tune with 3-7/16 diameter raised top pistons and a 8043DC cylinder head the SH carburetor should work okay. Governor tube to carburetor is a little shorter for a SH carburetor. Some use the H one but if so check linkage for clearance. Air tube will be smaller than SH carburetor intake. If tractor has a 8043DC gas head not much gain with a later head unless a LP one. If it has a distillate or kerosene head lose it. Using a 49900DC or DD camshaft would help just a little if it doesn't have one now. If wanting to make a bigger step to more power and block coolant jacket looks good. Bore block for 3-9/16 SH sleeves and pistons. Little safer than boring for 300 and 350 sleeves. Or get a C-169 or C-175 block or engine. Some SH overbore pistons when used with the 8043DC head may need die ground for clearance on combustion chamber edge across from spark plug so the sharp edge tappers off like a 8043DD SH head. Doesn't need much of edge. Make all combustion chambers the same. Don't get carried away grinding intake ports but check that manifold at head intake ports is the same or smaller than opening. Also that manifold is the same or bigger at exhaust ports. If you want to go all out for power you have to go past anything I mentioned.
 
I agree. A carburetor has little to do with horsepower, all it does is supply whatever amount of fuel the engine demands. Volumetric efficiency of the engine itself is the determinant of hp. If you want more hp, mods of the engine are in order.
 
Good to hear back from you.

If not serious on pulling, then the fire crater upgrade is best bang for buck IMHO.
 
If you want temporary power boost just for pulling, unhook the air pipe at the air cleaner and loosen the generator/alternator belt. Set your timing and adjust your carb on a dyno. Gat a couple larger ventures and play with them on the dyno. If you can't make it smoke by adjusting the load needle, you should increase the size of the holes in the main jet tube.
 

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