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Hello and good morning Jim,
Thank you for allowing me to assist you, my name is ***** ***** I will be happy to assist you with your concern today.
Exhaust manifolds being pitted would not prevent the boat from running unless inside exhaust ports where almost or fully closed off where air/exhaust could not leave the engine. I can help you locate them but I need the engine model and serial numbers and or a picture of the manifolds.
But again we would also need to diagnose why it will not run such as checking fuel, spark, timing, compression, etc.