"Have a 454/350 fresh water en
"Have a 454/350 fresh water engine. After starting the engine it takes a considerable amount of time for water to come out of the port exhaust vs. the starboard. Sometimes after starting and leaving engine at idle I hear a thump that sounds like cavitation. When I increase rpm's the noise goes away. While cruising at low rpm (1200) the port exhaust steams considerably. I have put a temperature gun on the engine at at all points it indicates 114-118 degrees. When the problem initially developed I checked the strainer and it was clean. I then opened the engines manifold drain ports and found a small amount of sand. Have rechecked drains and the water has no sand. Since initial sand removal, have run engine 50 hours at various rpm's with no changes. Getting ready to winterize, should I be concern about my observations? Any ideas as to what is causing my observations? Should I take some action before winterizing with antifreeze?"
"Have a 454/350 fresh water engine. After starting the engine it takes a considerable amount of time for water to come out of the port exhaust vs. the starboard. Sometimes after starting and leaving engine at idle I hear a thump that sounds like cavitation. When I increase rpm's the noise goes away. While cruising at low rpm (1200) the port exhaust steams considerably. I have put a temperature gun on the engine at at all points it indicates 114-118 degrees. When the problem initially developed I checked the strainer and it was clean. I then opened the engines manifold drain ports and found a small amount of sand. Have rechecked drains and the water has no sand. Since initial sand removal, have run engine 50 hours at various rpm's with no changes. Getting ready to winterize, should I be concern about my observations? Any ideas as to what is causing my observations? Should I take some action before winterizing with antifreeze?"