ORIGINAL: Tired Old Man
I don't have the precise name of the Devcon filled product. You can Google ''Devcon'' and work your way through a couple of Devcon pages to get to the right one. It's a titanium filled epoxy and the only one they have. It's better than the J.B. Weld by an order of magnitutde. Not a glue as much as a filler that accepts high tolerance machining and will handle the heat of the transfer and boost port sections of cylinders. It does not come cheap and is available in 1/2 and 1 pound quantities.
Checking my only remaining source for info on our intake manifold work ..... they were using the aluminum filled Devcon product. Similar to the titanium filled product at a much reduced price. It has very similar chemical and heat resistance as the titanium product. Its machinable, etc. As TOM suggested, go to the Devcon website and look under epoxy metal repair products. I think the titanium product might be overkill as an intake stuffer but both products should work OK. Devcon also makes pourable filled products for those who might prefer something like that opposed to the thicker putty products.