we have a c190 isuzu marinised engine on our yacht, which is one of the most ugly marinised engines you would ever see. By this I mean, it looks like whoever did it used spare bits from their garage to build it all up. But the engine goes and goes and goes, we motored down the east coast
last year (delivery trip on the nose all the way) and the isuzu never skipped a beat. I have spoken to the previous owner and he has suggested that I replace it as he thinks the head
bolts are all stripped and other issues also. But isuzu seems good, and my research
thus far suggest that they are reasonably sized for their hp.