Is there a way to reseal a leaking intake manifold?

I did a 318 poly that leaked in the same place. Cleaned really well with brake cleaner, and trimmed off the excess that was hanging out from first attempt. Then shop vac, to supply vacuum to crankcase, then applied silicone. Ultra grey or something similar. I figure the little vacuum provided would draw sealant into leak. Whatever the case it seemed to work.

brake cleaner, as little as what may have made it in would evaporate out before it hits operating temp.