Farmall H carburetor venturi

rustyfarmall

Well-known Member
Common ordinary Farmall H carburetor. Not a Super H or an M.


I was doing a full rebuild on an H carb and thought the venturi looked a bit odd so I got out the calipers and measured the I.D. and found the diameter to be a full 0.100" larger than a normal H venturi. That venturi had obviously been in that carb for a long time, and the carb had also been in use, although maybe not recently. I replaced that venturi with a common one from my used parts bin, but the question remains, what's up with the larger diameter venturi?? Have any of tractor pulling folks ever encountered such a thing?
 

I know those kits were available for the Ms, Super Ms, etc., but I didn't know any "perfomance improvement" carburetor kits were available for an H. Looks like an oversized venturi would reduce the effectiveness of the venturi and result in less lugging power.
 

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