Originally Posted by snapmorgan

I pulled the heads off of my 575 at 100hrs and the gaskets looked like they were within minutes of failing, BUT they were torched between the cylinders. There were no integrity issues at all where the water passages were sealed. I am sure that you need to replace the gaskets, but I don't think it is causing your low water pressure issues. For a gasket to be leaking bad enough to cause low water pressure it would have to be dumping a tremendous amount of water either into the bilge or into the engine, which in turn would end up in the bilge once the crankcase filled. If that much water was leaking from the coolant passage into the cylinder and going out the exhaust, it would have most likely hydrolocked by now and done some damage to the piston or rod. I don't know what the answer to your low water pressure problem is, but I don't think head gaskets will solve the issue.
I am just across the river if you need any help. I have a fully equipped shop and can help if you need any assistance.