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Maybe that's a solution for stuck pistons? Let the Lye dissolve the pistons?
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Yes, that was my whole point. Removing the pistons w/o damaging the block. Plus, you no longer have the sludge to deal with. Good blocks are hard to come by, right?
BTW, there are still Hot Tanks in machine shops, here in Oregon. They don't advertise them but, at least the 2 shops that I use, have them. I would guess that they are still used, in most areas. Nothing will clean a block like a hot tank.
I HATE sludge! I started as a mechanic, when I was 19 and being the youngest in the shop, I got all the worst jobs, like working on Corvairs and working under the dash, upside down and backwards!!!
The worst sludge I remember, wasn't on Ford FH's, it was working on those old Chev 216's. I still cringe at the though of having to clean one of them for a overhaul.