Well I drug home a '39 B several years ago. It was very seized and I knew I would have to rebuild everything.... But after I talked to folks, I didn't bother with the shims. I was getting the block remachined anyway so I had the main bearing housings cut round. While they should have been .006" -.000" short, they were egged (top to bottom) almost .006". The crush of the extra length (bearings) didn't really seem to show up when I gauged it after the crank was ground and block holes cut round. My reasoning behind what I did was the fact that I am not going to try to run this thing 200 hours a month (like a real farmer would) and modern bearings are harder than those produced 60 years ago. You (most likely) will not put the wear and tear on the beast that the shims were designed to compensate for. Yes, it was a bitc* to start the first few times (I still have only crank starting on it) with everything nice and tight. But I didn't have to drag start it the first time after the rebuild. I now have about 75 hours on it and it's wonderful. I can get it to catch on the second crank 95% of the time... If you have further questions, ask. I may have already been there... Chris Horn Scappoose, Oregon
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