Originally Posted By: Michael_P
I had 2100 hours on my 4.3 Mercruiser before a rebuild. It would have gone longer, but I wanted to do a rebuild to ensure reliability. When I tore it down, there were hardly any signs of wear less crankshaft endplay. It ran on straight 40W less cold weather.
Yes, these 4.3s were surprisingly hardy on the water. I've seen a couple break 3000 hrs. But at 2100 hours, that engine owed you absolutely nothing.