[Shop-talk] Adding a tube into aluminum manifold

[Randall]

If you're going to braze, threads seem redundant.  Just make a tight fitting
hole.

MAPP isn't much hotter, but the flame transfers heat quite a bit better.
Obviously depends on which torch and so on, but my propane torch just
couldn't get the casting hot enough to melt the brazing rod.

This all seems like overkill to me, though.  Car makers routinely put steel
NPT fittings into aluminum manifolds, and they very rarely rot out even
after decades of service.

-- Randall 
56 TR3 TS13571L once and future daily driver
71 Stag LE1473 - awaiting engine rebuild
71-2-3 Stag - awaiting gearbox rebuild