My '35 Standard has been sitting for about 25 years. Without removing the head is there a lubricant that will free up the pistons and rust, etc.?

Can I do this with minimum damage to the block, pistons, etc.?

Thanks in advance for responding.

Jim

I would recommend removing the spark plugs and spraying come PB Blaster penetrating oil in each hole. About 1 Oz per cyl. Let sit for a day after that.
Remove flywheel cover and use a pry bar on the flywheel teeth using edge of bell housing as a folcrum.
If that doen't work add about 2 Oz of ATF to each Cyl and let soak.