Buick 455 A.I.R./PS Bracket Information
Text and Photos By Warren Dennis
If you have a 72 GS 455 it probably came with an A.I.R.
(Air Injector Reactor) system installed. Because of the A.I.R. pump your
car would have a ram air cleaner with a triangle shaped inlet on the driver's
side and different power steering brackets that allow mounting the A.I.R.
pump. Like a lot of parts for our cars, the "A" body brackets
are different than those from the full size "BCE" cars and do
not always interchange.
Below is the complete setup for our "A" body cars positioned the
way it would be installed in the car. Power steering pump mounts in the
lower position and A.I.R. pump in the upper position.
Below is the A.I.R. pump adjusting arm and Power Steering
adjusting bracket. A.I.R. arm does not have any stampings or numbers and
can be identified by the mounting holes which are 5" center to center.
The PS bracket is part number 1238314 and is stamped 455-A 350
Below is the PS pump and A.I.R. pump mount. For the "A"
body it is cast aluminum, part number 1238313. Also cast 455-A 350
Last item is the pulley to drive the A.I.R. pump. This is
a add-on pulley that stacks on top of the water pump pulley to drive the
pump. Stamped 1238511 "FRONT". This seems to be the same for all
For comparison, the big car "BCE" setup does not
interchange with the "A" Body.
Both the PS adjusting bracket and A.I.R pump/PS pump mount
bracket are stamped "455 BCE".
The A.I.R. adjusting arm does not have any stamping and
measures 6 ½ inches center to center on the mounting holes. Compare
this to the "A" body arm above that measures 5 inches.
The BCE bracket also mounts the A.I.R. pump about 1 inch higher above the
PS pump then the aluminum "A" body bracket so it may cause clearance
issues with the air cleaner and hood.
Below is the complete package installed on my 72 GS 455.
Page from the 72 Service Manual showing how the brackets
are installed and torque values.