Are exhaust manifolds the same for 350 olds and 455 olds?

No, exhaust manifolds for the Oldsmobile 350 and 455 engines are not the same. While both engines belong to the Oldsmobile V8 family, their design and dimensions differ due to their varying sizes and configurations. The 455 engine typically has larger ports and different mounting points, making the manifolds incompatible between the two engines. Always verify specific part numbers and compatibility when considering replacements or upgrades.