Coolant Leaking from Thermostat area

[Robin Hood]

I have this problem with getting a good seal between my surge tank and the intake manifold. Seams like maybe the bottom edge of the manifold is pitted heavily and maybe eroded from leaking over the years.
I am thinking of pulling the manifold and lightly fly cut the surface to get it flat and no pitting.

Has anyone else had this issue?
Any help would be appreciated

[gdaddy01]

what kind of intake? I have a 3x2 intake that is very thin behind where the therostat goes, check to see if the intake inself is leaking and not the gasket surface.

[Robin Hood]

It is a High Riser on my Thunderbolt. I checked it with crack check and it was OK.

[Heo]

I had a leak down in that area. In the end the leak was between the tube and the flange

[Robin Hood]

Thanks I’ll check it

[PaulProe]

The cast flange that forms the connection between the tank and the manifold has a very narrow surface to seal with. Pitting is very common, it might be a "pinch point" in the corrosion process that goes on in the engines.

Flattening that surface to get more/better sealing is a definite step in the right direction. Gasketing and appropriate sealers are also recommended.