Parked downhill = coolant leak

[ExplorerTom]

I tend to back into my driveway a lot. It's a small incline but nothing serious. Today I noticed a wet spot on the driveway. I crawled under and it's coolant. If I park on a level surface, no leak.

Any ideas? I just found it and haven't had a chance to look closer at it.

 

[ExplorerTom]

Pretty sure it's my intake manifold gasket. I can see coolant under the intake manifold. Must have been running off the motor at that downward angle in the driveway.