I never knew the 4 cyl truck version had 40 HP.Driving one feels like a worn out six.There is one near me with no miles on it,the son of the original owner has it.His dad bought it new,thinking of economy,but he could never carry much in it.For the last 40 years or so the son has planned to buy a rusty truck with a V8 in it and do a changeover,they used to be plentiful,but he missed the boat on that.Now he feels it is too rare to do that too,and I agree with him.There are a lot of those trucks around here with the flathead six in them.We must have had a local dealer that pushed them hard.The flathead V8 in the Ford tractor was not exactly common,as it was not cheap,but there are a few around.The conversion was made by Funk.Very nicely done conversion.While the N series tractor was underpowered,it had enough to do what it was supposed to do.With the Funk conversion you had the power,but were limited by the size of the tractor.They just weren't heavy enough to to take advantage of the extra power for field work.There is one about 30 miles from me that has been on the same farm since new.It is mostly used now to run the sawmill.The owner said before he restored it most of the time it was left out in the weather.The spark plugs would rust in and break,and the manifolds would rust,break,and fall off.It doesn't get that kind of treatment any more.He used to take it to tractor and one-lunger engine shows,but I have not seen it in a couple of years now.There is another one that the owner uses it a couple of times a year just to bush hog with.That is a job where the extra HP really works well.He has three pipes on each side,right off the block,sticking straight up like the old dragsters.It sits in the garage the rest of the year with six coffee cans on the exhaust pipes.