PCM Excalibur 2000 hours - New Manifolds. Engine life left ? Looking at purchasing 2005 Ski Nautique 196 with high hours. If I had to replace the engine....Does anyone know what year truck blocks can be purchased? Or is the marine block different? How reliable are parts on current high hour engine when transferring over to new block. How many hours should I expect from the Excalibur? Currently compression is good and dealer is guessing 500-600 more hours out of the engine. Previously owned by group of 3 owners on private ski lake. Any links or suggestions helpful. Thanks - Mark