There's a guy over in Sweden that has a 75 Riv with a 455 in it. He broke the left side exhaust manifold and is looking for the correct manifold to replace it. I have a 455 in my 69 Skylark that came out of a 71 GS Boat tail and I have another engine out of a 75 La Sabre. Both the exhaust manifolds look exactly the same and was wondering if there was a difference in the 75's. Thanks for your help, Ron o No:
I do not know the answer to what are the physical differences but the difference in part numbers suggests there may be something. It may or may not be significant. Is the 75 tapped for a sensor?
