So water issue in 318.
From what little rust is in cylinders,one tiny bit at top of one bore and a couple taps with a block of wood to get it rolling,it wasnt there long.
Also it has been out for a while by the looks of the weeds grown up around it. If there is rust in intake the it came in via carb. As in no air cleaner. Will know when i look closer.
Also, its the same casting number block as my 318 with flat top pistones. Not including the ice one.