Hydro-locked...two rear cyls...

The wife's Winnie has hydro-locked...again. It did it two years ago, and I replaced intake gaskets......Now here we go again!!!
After breaking it down..the gaskets don't look too bad..no obvious leaks(as was the case before). Water on two of the back side pistons, and on top of the intake valves....Coolant jackets are on each end...water on #3&5 cyls. Tested water on top of #3 intake valve....did not float the balls in my anti=freeze tester:runaround:. This was after a solid day of rain. When I pulled the upper intake off, there was rain on top of the lower intake.....if the water builds up enough...the injector ports are submerged!!!
Could this be the cause of the hydro-locking??????????????

I've had difficulty getting the lower intake to "seal" properly ... and I never saw anything wrong with gaskets that I removed ... just took more than one gasket installation.

This is also why I leave the reservoir pressure cap a turn "loose". (Some folks think that's crazy ... so be it!... I'm hardheaded.)