Oil temps should be no cooler than 190 when using the application under severe load. Whether it boating or drag racing or circle track. Temps do not like anything above 230. @215, it breaks the moisture and lets the add packs do their job. Eagle rods run very tight side to side rod clearances and need to be relieved. I know it's a boat motor and requires major surgery to pull, but the side clearnaces need to be double checked and releived. Temps and oil control will fall back into place if you re-clearnace the rods and start from scratch at that point.