Twin H Manifold

[Deleted User]

What does an internal balance tube manifold with the casting number 5325118 fit?

nick s

thats a 55-56 308 manifold. The internal tube was required to clear the spring towers of the Nash body

It can be used on stepdowns but requires the 55-56 exhaust manifold (the interface between the manifolds is completely different) or headers. The 55-56 exhaust outlet angle and rotation is also different so it does require a little effort it is also 2 1/4 vs 2" of the stepdown.