Anybody use GTO exhaust manifolds on OBS tahoe 4wd?

[Goldhawg]

Carcraft says they perform almost as well as headers. Anybody know if they'll fit in an OBS tahoe?

http://www.carcraft.com/techarticles...e_header_test/

[hollywood63]

They don't look like would fit. Especially on the passenger side

[beertestr]

I've never test fit GTO manifolds in any of my swaps. I'm thinking the left manifold will be hard to plumb around the front driveshaft. If you can get your hands on a set cheap, it's worth a shot..
FWIW, I used truck manifolds in both my swaps. I even used the OBS y-Pipe.

[Goldhawg]

This may give a better idea...scroll down for pics. I have beertestr's mounts; believe they will clear those.

http://ls1tech.com/forums/conversion...asurments.html

[Goldhawg]

FWIW, I used truck manifolds in both my swaps. I even used the OBS y-Pipe.

Really? Cuz I had just swapped in a new magnaflow replacement y-pipe and I didn't think the angle of the hookup would work. Anything special that you had to do to connect them? Are all the truck manifolds the same? Are they the same as an express van? I don't think I want to use my escalade manifold (at least the passengers) cuz its got a massive EGR port I hate, so I'm looking at an LQ4 from an express van for parts that I might use--including the exhaust manifolds.

[beertestr]

Really? Cuz I had just swapped in a new magnaflow replacement y-pipe and I didn't think the angle of the hookup would work. Anything special that you had to do to connect them? Are all the truck manifolds the same? Are they the same as an express van? I don't think I want to use my escalade manifold (at least the passengers) cuz its got a massive EGR port I hate, so I'm looking at an LQ4 from an express van for parts that I might use--including the exhaust manifolds.

The full size truck manifolds, and van manifolds are all the same. The early ones had the EGR port machined in, the later ones stil have the EGR bump and hole in the heat shield, but not machined. The Y-pipe cleared everything, admittedly though, it does hang a bit low on 2WD trucks. On my 4x4, it didn't hang below the frame rails. The muffler/tailpipe assembly sits closer to right side frame rail. I actually had a complete 2004 SCSB exhaust system on my 94. I just needed to stretch the tailpipe about 10" and make new hangers to fit it. The current owner of the truck is still running my setup 4 years later with no exhaust issues.

[Goldhawg]

The full size truck manifolds, and van manifolds are all the same. The early ones had the EGR port machined in, the later ones stil have the EGR bump and hole in the heat shield, but not machined. The Y-pipe cleared everything, admittedly though, it does hang a bit low on 2WD trucks. On my 4x4, it didn't hang below the frame rails. The muffler/tailpipe assembly sits closer to right side frame rail. I actually had a complete 2004 SCSB exhaust system on my 94. I just needed to stretch the tailpipe about 10" and make new hangers to fit it. The current owner of the truck is still running my setup 4 years later with no exhaust issues.

Just to be clear, were you able to use the OBS y-pipe or the NBS? In your first post you said OBS which got me excited. But this 2nd post sounds like you used the NBS y-pipe. If I could bolt my almost new magnaflow ypipe to the LSx manifolds that will make the swap much easier. If the NBS ypipe works I'll start having to look for one.

[jcrumpley]

I used y-pipe and exhaust designed for a 2002 on my 1992. As stated the y-pipe hangs a bit low but my 2wd is lifted.