The middle port is not a water port...it's a heat crossover port and the performance heads don't use it...
If you are talking about the rear water port on the head at the manifold mounting face, the manifold blocks this off. ALL small block chevy's are this way unless the manifold is specially modified or is a race manifold.watchdude1 said:what about the back open port in the back side of the head it will be blocked off ?
the manifold does't have an opening on it. will my manifold work on those heads thanksfor the info never saw this situation the old heads match the old manifold that is what makes me wonder.