Now that we see the quantity and type of parts you want to seal.
1 gallon of 10w30 and mix in a pint of engine assembly lube STP. Mix it all together. Now you can spray that on the blocks and heads for storage. Let it drip off for a day then put them up on the shelf. The motor oil alone will keep the cast iron from rusting, but with the STP it will stick on there for a long time.
Brush on the crank journals with straight STP, then spray the rest of the cranks with the oil treatment. Good to Go.
