Definitely an interesting tip/trick. Thanks. Although I have never had a fully seized engine i wanted to rescue, I have been partial to a 50/25/25 mix of acetone, atf and Seafoam (or Marvel's), in attempt to loosen stuck rings and carbon build up. Approx. 1/8 cup each cylinder and 1 to 3 days wait has helped me greatly. i can see how your grease gun approach may benefit, but i also would opt for using a spark-plug hole adapter to pressurize the cylinder after all pistons and rings have soaked.

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