So just for folks information. There are two types of sleeves that went into these old tractors. A .040 thickness sleeve and a .090 thickness sleeve. What you're seeing here is the .040 thickness sleeve. The .090 sleeve wasn't used until the middle the 8n run. So if you have a 9n, 2n, or early 8n these used .040 sleeves. Now here is the fun part. Many of these early tractors during their first rebuilds had the sleeves pulled, honed the owners had the parent bore in the block honed and ran a 3.228" piston in the parent bore. This worked fine and well and bumped the power 1-2 HP, but then you had another problem when you had to refresh the engine again. With as much farming as folks did with these machines back in the day it's not uncommon for them to have been rebuilt 3-4 times in their lives. Once you run the piston in the bare bore the most commonly executed option at that point is to have the block bored for the .090 sleeves and take the tractor back to the OE bore size. There are oddball sleeve piston combos that have been conjured up over the years so bear that in mind too but what was described here is what you'll normally see.
