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Re: Cast header question
I can't say I am in love with that idea. The pipe welded into frame as shown creates clearance but reduces the cross section of the boxed rail. Unless you compensate for that somehow you have created a significantly weaker spot with clearly defined borders. I'd much rather see a clearance hole in the boxing plate.
if you want a dished shape to weld in and don't want to pound your own out of plate you could buy a weld on round pipe cap (expensive) or cut a piece out of a condemned inert gas cylinder, or......
These cast LS headers are often sold with an option of ductile steel, so you could slice the flange off, weld on a pipe to bring the flange down past the
obstructions and weld a flange on again. Quite a few people modify factory LS truck manifolds the same way so those castings may take a weld Ok as well.
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