My guess is the swing check valve would stick closed (or open) in very short order. C-30s the engine (I think) in the lowest part of the boat and the only right way to get really good access is to remove the galley cabinets. Sounds difficult but the guys that have C30s in my YC do it quite often when working on theirs.
Don't know what engine you have but here's some stuff from Catalina direct
Catalina Direct: Exhaust Riser Universal Diesel Equipped C-30
Denise, Bristol PA, Oday 30. On Tidal Delaware River, Anchor Yacht Club.
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Last edited by deniseO30; 12-12-2010 at 01:04 PM.