Several years ago I found 7 cars in a barn in Florida. One was a 1969 Mustang Mach 1. Yep, a 4-speed original car like this. All cars had been driven into the place and parked. After carefully removing and assessing all the cars. I then had a plan to move forward. I'll talk about the Mustang only. First thing was to see if I could rotate the engine by HAND ONLY. No Luck! Second was to pull spark plugs squirt a mixture of ATF and Acetone into each cylinder and let is set for a few days. Next pull valve covers and see if it looked like condensation or corrosion had been there.. All Clean! Now with a socket on the crank pulley, see if it would turn after it had soaked. NO LUCK at all! More soaking and after a few more days-- still stuck.. So NOW, into gear and rocking back and forth-- Still stuck! Keep in mind the guy I got these from and his family all told me about these cars and when and why they all were placed in storage. I had more than one person confirm this Mustang ran great. Well, it was not budging, So I pulled it out of the car and opened it up. What I found was the heat from the ground inside that metal building with a "sugar-sand" floor had been so hot over the years, the crankcase oil vapors had "glued" the pistons to the cylinder walls. Had I put a battery to it or trying pushing it, I am sure I would have broken pistons! Of course the valve guides were also so dry, valves would have clobbered pistons and the engine ruined! My patience paid off! A very through cleaning of all parts, lubing it all up and reassemble was what it took to get the engine running. The rest of course is all the fuel system brake system tires -- on and on.
