I have a 351C engine that has been machined and rebuilt about 5 years ago and has been sitting on an engine stand since that time. Attempted to turn if over manually but felt much resistance. I have not gone into the engine to see if there is any rust or other damage to the cylinder walls but before I do I want to inject a small amount of ATF into each cylinder via the spark plug holes to see if it would free up the engine. There is no engine oil in the crankcase. Is ATF satisfactory for this operation or is another material or a totally different approach recommended? Don't believe the cylinders can withstand another boring.