I would not leave it wrapped in plastic film, in a plastic box in a garage if its not heated and ventilated - more perfect conditions for condensation from temperature change and winter damp I can't currently think of.
I have two Lancia and Rover K-series aluminium heads stored under the house - nice and airy. And a brand new one in the front bedroom
I have two Lancia and Rover K-series aluminium heads stored under the house - nice and airy. And a brand new one in the front bedroom





built my 2.1 ltr pinto ford engine in dining room as well before it got furnished as well. white sheets on the floor no dust while it was rebuilt 

