Any suggestions for freeing stuck pistons in cylinder

[limeex2]

you do realize metal is impermeable? nd that any chemical reaction in galvanic corrosion would occure far sooner than two weeks?

Yes. The time period mentioned is an attempt to give the penetrants time to work. With a seizure of this magnitude, what happens to the piston and bore are secondary to a point. Saving the pistons is out of the question and cylinders can be replaced, bored or re-sleeved depending on the owners intent on keeping it original. Any galvanic? corrosion has already occurred. The penetrants or other solutions mentioned here are petroleum based and should not cause more corrosion.

[Carter Turk]

I wonder if getting some schedule 40 electrical pvc pipe slightly smaller than the bore diameter & some steel angle iron or box tubing wide enough to strap heavy duty ratchet straps on each side of 1-4 cylinders & another angle iron/box piece below frame with wood shims between frame rails & oil pan. Cut the pvc pipe into 1/2" rounds over 2-3 cylinders to start (assuming 2-3 or more stuck than 1-4), crank ratchet straps to more than snug & work the bolt on end of crankshaft in the proper direction to push the pistons down from TDC. Or 2 all-threads with bolts on each end, drilled thru angle iron or box. Maybe a second set of hands to do ratchets while one works the crankshaft bolt.

Have no idea if this would work, just a thought