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Manifolds Riser Spacers Riser Elbows

I have a pair of 2003 Crusader

I have a pair of 2003 Crusader 8.1L engines in my Silverton 330 with 400 hours on them. We use the boat primarily in the brackish water of the St Johns River with occaisional trips on the ICW. What should I be prepared to do about Maifold / Riser Spacers / Riser Elbow replacement?
Would it be safe to assume that the Riser Elbows would be the most effected part as it is the only part subjected to the raw water?
Any thoughts?
 
"Correct. In fresh water they

"Correct. In fresh water they last 20 years; in salt a lot less. In your case, I'd say 10 years eaisily.

Jeff"
 
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