long term engine building

3-4 monthes they shouldnt rust anyway. But in CT, when the car gets put "in the trailer/garage/tent/whatever" the guys use the motor fogger. You can get it at marine supply houses too. A friend also uses ATF occasionally when he runs out of fogger. I left my Swinger outside for all last year (in a "Cover It" style soft garage) and there was no trace of rust on the bores.