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3196 Aftercoolers

Hi, I am about to purchase a 2000 SeaRay with CAT 3196's.  The engines were totally re-built in 2003, Main Bearings, Pistons, Rings.  I am told that the boat currently have the "Series 3 Aftercoolers".  Are these versions known to have solved the problems with the earlier series coolers?  Should I be concerned about getting into these engines/aftercoolers, considering I plan to be diligent about monitoring and maintaining them?

Thank You.