Storing my SS for 3 year.

Well, does the barn have a wood floor? If it does, it usually keeps things quite nice for storing vehicles. I used to live in an old farmhouse with a large barn - we kept a few cars (64 Impala SS Vert, 55 Chevy Pick-Up and a 57 T-Bird) in there for 3+ years without any large problems. Just mainly tranny pan gaskets and rotten belts. If you are going to drive it a few times or more a year - I wouldn't worry about too much - a cover would be great to keep the crud off of it.
There are lots of posts about storing cars. Try a seach and see what you find.
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ANdy
Unless someone is willing to drive it at least 10 miles each time they start it, I would not have it started at all. Starting these cars and letting them idle for a few minutes does nothing but introduce massive amounts of moisture inside of the crankcase and upper valve cover area. Also fills the exhaust system with water. Driving around the block once or twice is not much better.
1. Add a double dose of fuel stabilizer to no more than a 1/4 to 1/8 tank of gas. Drive it around to mix well and get it up into the fuel rail, etc.
2. Store with clean oil.
3. Fill tires to at least 45 psi (they will slowly leak down after a year or so)
4. Leave all windows closed.
5. Disconnect both battery cables. No need to remove battery.
6. Clean exterior surface and use a good / soft car cover.
7. You can plug the tail pipes, but I don't really know how necessary that really is.
8. Store in a [DRY] garage (I guess a barn is better than nothing, but I would be worried about rats and mice and possible moisture)
Note: When you get back, and before you start the car:
1. Charge battery
2. Remove the fuel pump fuse
3. Allow the engine to spin for about 1 minute to insure the oil press. comes up and the lifters get filled.
4. Re-install fuel pump fuse and start.
Note: The tires will be "flat-spotted" for about the first 75 miles. Don't worry about it.
Note: Putting the car on blocks is now not the recommended procedure, but that's up to you.
Some folks will tell you to spray WD40 in each cylinder, but I don't think it's needed if the car is in a fairly dry place.
Have fun overseas!
My '94 was in a commercial storage garage for 2.5 years while deployed to Romania and Germany. I did virtually all of those steps listed above and the car was hardly affected by the storage. I overinflated the tires to keep them from flat spotting and my father stopped by a few times to top them off. Ensure the gas tank is absolutely full and has stabilizer added. Also change to fresh motor oil immediately before storing. That avoids the acids and contaminents going to work on your bearings while you are away. I also placed rodent poison in the corners of the garage, but had no evidence of their activity. The owner of the facility kept on top of things and had his own rodent poison outside around the buildings. Follow the advice above by Tin Indian and your car should be none the worse for wear when you come back.
almost forgot: DO NOT have someone come by and start up the car from time to time unless they are going to drive it long and far enough to get all systems to operating temp. Otherwise you are doing way more harm than good.


