Offenhauser 4bbl intake value

"you can only run headers with this intake. "

there are several different versions of Clifford slant six intakes, the one shown in the photos above has a heat stove on the bottom side that should mate to a stock
slant six exhaust manifold.
The Slant Clifford Intake that I run has a hot water chamber on the bottom side, (its not water cooled, it is water heated) and has nitrous bosses at the runner flanges.
I machined the bosses to accept injectors and run MPFI, with that I have the hot water chamber not plumbed.