CARBURETED Models

To meet Federal emission standards at all altitudes, all vehicles using feedback carburetors are equipped with a high altitude compensation system.

The system consists of a High Altitude Compensator (HAC), vacuum switching valve, distributor equipped with high altitude advance system, passages for additional bleed and jet air, and 2 reed switches. The system may also include dual catalytic converters. As altitude increases, air pressure decreases and the air/fuel mixture becomes richer. The HAC system supplies additional air to the primary main well.