Good Luck! A solution to your problem I've long wanted to try is; park the truck on a pretty good hill. Pull sparkplugs and pore several ozs of Coke in each cylinder. Then with the transmission in high gear walk away for a few days. When the truck is at the bottom of the hill you'll know the carbonic acid in the Coca-Cola has done it's job of dissolving the rust that had rust-welded the pistons to the cylinder walls.
RonR
RonR
1951 3600 with Clark flatbed, T5, 4.10 rear
1970 340 Duster
1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain)
1964 CJ5
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