I was just going through a Chevy Small Block Parts Interchange Manual by Ed Stoffel and he says GMPP makes Stainless steel headers for our cars with the AIR tubes and O2 sensors. He gives PNs 12341404-12341408. I checked on the GMGoodwrench website but couldn't find them. Has anyone heard of these or even bought and installed them? Seems like if GM made them or designed them they ought to fit properly and work well, too.

 

Those were the stainless steel tri-y headers. My GMPP catalog from 94 also shows a complete exhaust and runners available too. I think they might have been SLP parts sold by GM. The pictures sure do look like SLP parts.