After rearranging the garage to create work zones for this project I dug out the wiring harnesses I pulled from the Sierra and connected them all together again. I went back to the yard to pick up some needed bits to solve some mysteries and those are all shown connected here:


Since I knew I needed to solve my exhaust manifold problem I ordered (again, from eBay) this driver-side '98-'99 F-Body LS1 manifold and this mystery pair of manifolds. These are steel tube so they can be welded on pretty easily for modification. They did not fit in stock form (which was expected) so I cut off the lower flanges of the 2 driver-side manifolds so that I could combine the smaller of the two pieces.


I still need to weld closed the O2 bung and install one on the other side of the tube due to a frame clearance problem. The passenger manifold doesn't quite clear the passenger frame rail with the engine located where it sits now - it will need to be raised at least one inch. This is why I have waited so long to pick out a motor mount solution... still contemplating a few options...

RamairZ - do you recognize that driver manifold with the exit tube in the center? Can't figure out what it came from...