It's odd; but your reply was useful to me as an outside observer. I have an Oliver 1755 that needs a rebuild; and I've been scared to death to do it. Why? Because I've grown up on an IH/Farmall farm and watched/helped my brothers rebuild a D407 from an 856 twice and a DT407 from a TD15 twice. My one brother, especially, is an extremely careful mechanic and has rebuilt everything on the farm from engines to torque amplifiers to truck engines.
I remember that, to do these IH engines, he did have the blocks machined professionally. Then he bought sleeves of various sizes and pistons of various sizes from the IH dealer. He rented a sleeve pressing rig that could measure the pressure during the press-in. He fretted and sweated over whether the pressure was within tolerance, sometimes getting a sleeve all of the way in before deciding that it wasn't right...pressing it out and pressing in another sleeve with better pressure.
He also was very careful to measure the tolerances of the pistons in the sleeves.
STILL...after one rebuild, the engine started knocking maybe a few hundred hours in. He took it apart to find that one of the sleeves had shifted.
He ended up getting a new block and rebuilding nearly from scratch.
I guess what I learned from this is that, not all engines are created equally from a rebuild standpoint. The guys in the Oliver forum are saying that the 310 in the 1755 is a straightforward rebuild. My (indirect) experience with IH blocks had me doubting that; but at least now I know why.
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