Before I weld these up, are these just random PO installed holes or are they significant? I already welded necessary holes I had to drill back out. Trying to avoid a repeat. Passenger floor.
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Thanks a bunch. The info is both interesting and helpful. I'm welding several dozen PO installed holes and maybe 10 or so unnecessary factory holes in the firewall. Tub is completely stripped so, now is the time to do it.They're probably what the OEMs call "tooling holes". The fixtures that are used to align the various pieces on the offline tooling adjacent to the assembly lines need to be able to orient the separate pieces of assemblies so that the line personnel don't have to measure anything when they're assembling. The individual pieces of assemblies rest on pins on the fixtures so the assembly personnel don't have to hold them individually. The size of the tooling holes is directly related to how much variability the engineers build into the part relationships when they design the assemblies.
If there are plugs available why not use them? Makes less work for you.