I am restoring a 1952 CA which has a cracked exhaust manifold. The Service Manual says that the CA has two different exhaust manifolds, one type for low octane fuel (which has a low profile muffler) and one for gasoline (which has a high profile muffler).
My question is are the two interchangeable? I would like to replace my low octane fuel manifold with a gasoline type manifold so that I can put a high profile muffler on my tractor. I would appreciate help.