The internal cooling channel in the Offenhauser intake can be used for movement of coolant (cooling system water) into one side of the bottom of the intake and out of the the other side (using a plate on the base of the intake).
Or, metal tubes/pipes can be run from the plugged holes in the Fenton exhaust headers to a plate on the bottom of the Offenhauser intake.
The relative merits of these two methods have been discussed in earlier threads on this forum. Search on "Offenhauser". Here is one thread:
http://www.stovebolt.com/bboard/cgi-bin//ultimatebb.cgi?ubb=get_topic;f=2;t=005478#000011
Good luck,
Tim
