Ultra Black RTV is good stuff.
Just checking did you degrease your mating surfaces with Brake Parts Cleaner before assembly to remove any oil film ?
I would hit the leak areas at the china wall with Brake parts cleaner and compressed air quick.
Then would take a razor knife and cut back the RTV at a 15° angle down from the intake manifold down to the center of the china wall. Then hit real quick again with brake parts cleaner and compressed air for a final clean.
Then put another new bead of RTV on, let dry overnight before starting the engine so it sets up properly and seals.
Good to Go . . .
This 318 intake pictured hear is sealed with Ultra Black RTV Gasket Maker. If you expand up the picture you can see it well.
No leaks front or rear china wall . . .
Can run a wet finger over the bead of RTV one time right away, to help shove it in there. Makes it look nice, and can clean up excess with a wrag.
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