Corrosion life expectancy?

[lowcountrybird]

If you have a Mercury Inboard 5.0L Engine with the following facts:
1. Occasionally used in salt water
2. raw water cooling system
3. stored out of water on boatlift
4. after each use flushed with fresh water
5. finished off with "salt away" to manufacturer's instructions
6. also fitted with "guardian" pulsating unit

Question:
Taking all the above into account, what "corrosion" life expectancy can one expect before the casting separation fails and water penetrates into the engine?

Any factual advice or actual data would be greatly appreciated.

Thanks

 

[bondo]

Ayuh,.. I'd guess you can expect to get 5/ 7 years outa the manifolds/ risers....

Probably a Lifetime outa the Motor....

 

[chiefalen]

mine is a 86' flushed after every use same mani riser changed once.

 

[lowcountrybird]

Thanks for the reply.