Re: 1949 Merc 8CM engine
When you get it apart and it's just the pistons stuck in the bore, mix up a bottle Acetone and ATF, 50-50 and put an inch or so on top of each piston and let it sit a week or so, topping up as required. If you can get it on an engine stand rotate it so the piston tops are level and do each bank separately.
cheers
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1949 Ford F-47 with a '51 8BA Flatty, GM TBI fuel injection system, and a grey shop cat, Spot.
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