need a good readable or pictures of the cooling system

[rugratsawesome]

need a good readable or pictures of the cooling system for 350 mercruiser its a closed system/with raw water

 

[Bondo]

Ayuh,..... Welcome Aboard,....... What vintage,..??

 

[Bt Doctur]

a "closed system" means A/F filled motor with the raw water going only thru the HX and out the elbows.
can you narrow down the year or a engine serial number