Exhaust header

On the original cast exhaust header the 3 and 4 exhaust ports are larger than the rest but CI's headers look like all of the pipes are the same size so does the flange just block off the top part of the two middle ports?

Ideally you are supposed to use a center port exhaust divider.

http://www.mustangandfords.com/techarti ... to_13.html

http://www.mustangandfords.com/techarti ... to_14.html

Clifford's sells them as do some other places.

The headers work fine without the divider, it's not strictly necessary.