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I'll try to summarize. I have a 2003, 285 ssi with twin Volvo Penta 350's and DP outdrives. Didn't get them properly winterized. Cracked both blocks. ordered 2 new remanufactured engines with new manifolds and circulating pumps. Had new engines professionally installed. Took boat out, and starboard engine alarmed out after about 8 minutes of cruising (idled out fine). Returned to mechanic who went out for ride with me and used temp gun on both engines. Thermostat housing on starboard was 20 degrees hotter than port and engine alarmed again. Mechanic changed out thermostat. Still alarmed after about 8 minutes cruising. Returned boat to mechanic. Both outdrives have been removed and inspected. No issues there. Clear hoses have been put on to inspect for correct flow. Flow is correct. Old circulation pumps have been put onto new engines with a 5 degree temp improvement. New impellers have been put in and raw water pumps inspected. Service department at the marina informed me the boat now cruises without alarming, but temp now climbs at 800rpm or less while idling out of marina. Service department is convinced it is a flow restriction somewhere. I'm not certain it is. Any suggestions?