This is a picture of the two versions of the Hall manifolds together. These pictures are from Jeff Burgy who had them both together at the time. I had them both also but never together for a family picture.
The top one is the raised port for the A3 heads. The bottom for the original iron 4v head.
You can see that the bottom of the intake port is actually filled in about 5/8". If you look closely, you will also notice that the top of the port is raised up about 1/4".
You will see that change in the outside of the port runners also.
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