I have about 450 hours in salt. There was a leak on the riser gaskets that spit salt water onto my manifold. I had to replace anyways and thought I would have to replace both riser and manifold. Took off the riser and luckily it wasn't bad. Cleared out the water jackets and scraped off the rust and blew and vacuumed out the rust. Used some RTV red hot silicone, gasket and silicone again and replaced the risers. Make sure you use some WD-40 on the riser to get it back into the baffle. I was told to replace and inspect every 2 years when running in salt. I think the Salt Away definitely helped slow the rust down. I will be firing the engine up when I get home, had to let the silcone dry, to see if I did ok. If you are taking off the manifolds, my mechanic said to get some help, they are heavy. Pull the spark plugs out just in case you drop the manifold so they don't crack a plug and get stuck. Let me know if you need more info.
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