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Frank, they had heat exchangers and purge tanks for the engine water jackets, so I really can't explain the rust. Unless the manifold got seawater and the engine got coolant?


Probably not - actually, the rust I'm seeing on the outside is normal around salt air, spray and ocean bilge water. The inside of the jacket doesn't look too bad - maybe mostly scale.

One thing I'm glad I don't have to ever do again is boil out a raw water manifold in acid..... nasty process. <img src="/forums/images/graemlins/baby.gif" alt="" />

Frank

'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum