Hello, I bought a boat of my father this past week. The boat had a 1995 Mercrusier 5.7l engine, and he never winterized it and the block cracked. Long story short, we had a 5.7l block out of a 90's model truck laying around. Everything looked to be the same at the time. So he took both engines to a local machine shop to change the blocks and freshen the new motor up. Now I am working on installing the engine in the boat, but I noticed a difference in the water pump. The new (truck) block doesnt seem to have a third hole on the left side where the water pump mounts. There is a port of some sort going through the water pump that looks like it should go through the engine. Any idea where this port goes and if it will matter? After looking online, some marine blocks seem to have it and some don't.
It is the bottom hole on the left side where the water pump mounts.
It is the bottom hole on the left side where the water pump mounts.