I store my Classic Roadster for the winter. Before I store it I put a few ounces of fuel stabilizer in the fuel tank. I run the car up to operating temp., to distribute the fuel stab. throughout the system. When it is running I pour some Dexron II down the carb to "fog" each cylinder. I shut the motor down immediately. I then drain the
oil and remove the filter. New
oil and filter. Once a month, turn the motor over without starting, to avoid damage to the valve springs. The new
oil should not create any condensation in the crank case as this comes from the air as the motor is running. It is not the water that damages the bearings, but the combination of water and the unburnt carbons in the oil. They combine to make a corosive that will eat at your main bearings over time. I have followed this procedure for all my toys for years. Never had any problems.
Another handy use for the Dexron is to put about half a quart in the crank case just before you drop the oil. The Dexron will rid the crankcase of any sludge buildup and thin the oil for quick and complete draining. IMHO, do lot let your old oil sit in the crank case over the winter or for any extended period of time. The contaiminents in the oil will combine with any moisture and will do damage to your main bearings.
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"The 427 Cobra is easily the highest performance car ever sold for street use. A decent 427 - not the worst, not the best, will go from zero to 100 mph and back down again to zero in less than 14 seconds. All thing considered, you can put together a pretty good argument that the 427 Cobra is the ultimate performance car, judged on any basis you want to name." Taken from; Corvette, The Sensuous American