Did GM ever have different style passenger side exhaust manifolds? One with a donut seal and spinning flange on y vs's flate flange no dunut seal and welded flange on the y pipe? Keep in mind this only pertains to the passenger side exhaust manifold.

 

Manifolds are different between 4.8/5.3 and 6.0. Don't know of any other changes.

 

+1, there were pics of the differences on here a very long time a go...creederado (who hasn't been on here in a long time), put a 6.0 exhaust on his old ecsb a while back and posted pics of the manifolds and y/dual pipes...

 

Thats exactly how mine are on my 06 5.3L

 

Yea I did a full search before I posted this thread and all I found was that the passenger side 6l manifold had a larger collector then the drivers side.

 

exactly how what is, which style? lol

 

Hmmm, that may be the only difference, I'm not 100% sure...