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Anyone know what these "factory headers" are for? I bought them thinking they were for a late model GM pickup with an 8.1 L engine and I planned to use them just for engine start up and break in on the stand. They appear to be stainless steel. Went to the hardware store to get some pipe plugs to fill the approx 3/4 inch air injection reactor holes in each tube, but the holes are metric size and thread. The headers DO bolt up to a factory big block head. O'Reiley's Auto Parts could not find a donut gasket for the 3 bolt flange that connects to the exhaust pipe.
which makes it a probably a C5 or C6 Corvette header
That is not a production based LS series motor head, maybe C5R that head is 6 bolt mounting, and exhaust port bolt pattern is not like any production LS. As far as headers, don't know
Probably late model Vortec truck big block motor exhaust but, never seen those before. They won't make a lot of power, too small of an outlet and poor collector.