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Grand PrixThis long running model has seen many changes, from a large RWD car, to a smaller RWD car, to a small FWD car, to a large FWD car, and with its available supercharged engines, and powerful V8s, it has never left the limelight as one of the most popular cars in America.
I recently aquired an original 421 SD Manifold to replace the aftermarket one. The front of the manifole has the large opening for the thermostat housing. beside it is another water jacket smaller opening with two attachment screw holes. Anyone know what goes on this opening?
421 SD duel Quad Manifolld
