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Return to Parts List Category : L- AR Engineering Products ARE AR329 BLOCK OFF PLATE, HEATER FOR THE BLOWER MOTOR ON 1964-72 A-BODY CARS $30.00 AR329 – block off plate for the blower motor on 1964-72 A-body cars.  The heater blower motor is often removed on A-body car when installing a big-block or Hemi engine.  This 14 ga aluminum plate is designed to bolt into the existing holes in the firewall to cover the hole left when removing the blower motor.  AR329 plate includes pressed in studs and comes with the correct gasket from Detroit Muscle Technologies.