1981 WASTEGATE ACTUATOR - For 1981, Buick changed the wastegate actuator from a normally closed design, to a normally open design. It was an attempt to improve fuel economy that was quickly abandoned in 1982 in favor of increased performance. (The NC design has more precise boost control.) The 1981 unit can be identified by the use of only one vacuum hose (instead of two). To accommodate this change, the wastegate lever on the elbow was rotated 180 degrees. A conversion is as simple replacing '81's actuator and elbow with '82/'83 units. If the turbocharger has been replace, this may have already been done.