My engine builder said use Devcon Titanium epoxy also but finding a supplier was difficult in the time frame I was dealing with. I ended up using quicksteel epoxy. It was a two part epoxy rated for 500*. Make sure the package has at least a 500* max temp and the product is "machinable". It should say on the package.
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1985 W350 Crew Cab NV4500 D80/D60. S362, port/ polish, runner intake, backcut/ swirl polished valves, titanium retainers, 60lb springs, O ringed, 188/220 Hammy, 5x16s, Polydyn Marine Pistons, balanced/polished rotating assembly, 3rd gen IC
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