I fought a similar problem for a long time on my 1939 A. The problem turned out to be a restriction in the intake manifold. I bought it with a stuck engine, and put new sleeves & pistons in and completely rebuilt the motor, but it always seemed to run bad under load, like it was missing on a cylinder. It would start on two cranks and idle great, but when advancing the throttle, it would 'putt-putt' like a 2 cyl. John Deere. Switched carb and mag with my nice running B, made no difference. Checked timing, valve clearnace, etc. many times; still ran bad.
This spring I took the carb off to clean it when it flooded, and I put my finger in the intake to see if it was wet from gas. That's when I noticed the passages felt restricted. I took the manifold off and found that were the passages branch out above the carb were restricted down to about 3/8" or 1/2" hole, and they should be about 1". I couldn't get the stuff out of the manifold, even by sandblasting. It almost looked like casting slag. I bought a new manifold for $100 on eBay, and the tractor runs great now.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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