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Let me cast my vote for the "Zane Whang". As recommended by Zane, get a 6 inch x 6 inch square of steel plate, 1/2 inch thick or thicker. Make sure the recess in the block (that accepts the top flange of the sleeve) is clear of carbon and crud. Put the sleeve in the cylinder, put the plate on top of the sleeve, and drive the sleeve into the block with a sledgehammer. It is normal for the sleeve to stand proud of the block by up to .005 or so, so don't try to pound it absolutely flush if it doesn't seem to want to go down any further. If you are going to try the freeze method, you must also warm the block. Just freezing the sleeves does not work -- they warm up as soon as they touch the block and hang up in the cylinder about 1/3 of the way down. Maybe if you get the sleeve to 0 degrees, and the block to 200 degrees, they will "just drop in". Zane said to skip the freezing bit, and I think he is right. Just pound them in with the steel plate. Don't try to cheap out with a block of wood or a too thin steel plate. The former cannot drive it down the last 0.1 inch, the latter risks cracking the sleeve. I did my engine as Zane recommended, and it worked really well.
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