Well, we when down this weekend, started the engine and brought it up to op temp around 150-165 and started closing the by-pass. The temp was slowly rising so I completely closed the by-pass. She was still running hot @ 190-200 @ 1200 RPM. We must have clogged jackets in the engine. So I bought a MMI Flush Kit along with a new impeller, thermostat housing and gaskets. The old housing is badly detererated and may not be making contact with the top of the thermostat. I'm tired of loosing weekends on the dock.
Very frustrating, but we will get there.
This weekend I will start point to point and look at where the blockage may be. But it must be in the Block.
Chief