DO NOT PULL THE STUDS OUT unless absolutly needed. A good modern shop with BIG equipment can set them up from the crankcase end and bore them with the studs in. Pulling the studs out on a lettered series only leads to more problems as they go into the water jacket and the back of the studs get eat up and tear up the threads on the way out. I can't remember for sure if the models 50,60,70 have blind holes or ones bored into the water area ?
Now on the bore size. If you need .045" over you go 5.5" plus .045". The PISTONS are to be made to allow for any extra clearance needed. I have yet to see any that weren't. Easy enough to check beforehand.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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