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The more you talk, the less you know. At some point, you'll stop. Although, as with most people that don't know what they're doing, you'll keep rambling until I give up trying to convince you that you've got cubic zirconium at diamond prices. They put those O'rings in there so they could be made with minimal interference fit and built as a production type part. Kind of a band aid to allow for a sloppy fit. With the "make to order" type blocks that are being done now, you shouldn't need o-rings, just set the interference where it belongs and take the time to do it right, not fast. Kind of like that ledge on the back to make sure the sleeve doesn't go anywhere. A simple pin thru the block, ground flush will do wonders to hold things in place. Sufficient interference fit will do the same thing, but the block probably wouldn't handle a 5 thou interference at the head end. I think it's hollowed out up there to allow for some cooling. I believe the guy that does the sleeves in the stock blocks welds the sleeves in. No, they aren't perfect and it's possible to have problems, but he's also making them up to 7.75" diameter. If you just took one to 6.75" or so, you could put 1/4" between the sleeves and ensure a solid weld bead all the way around. Would be a much tougher setup than a Powerblock ever was. Powerblocks were made with cheaper iron than Deere used in their (or me in my) blocks. At 7", you won't need reinforcements back to the tractor. Good thing you are a Rare Part Collector, cuz i think that one will have dust on it for quite a while at 4k. So when do you want the 3o just like it? I'm giving you a bargan at $3500. No, wait, I like you, make it an even $100k and you'll have them in October. All machined out (no sleeves of course)
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