Approval Details

Valid E.O.


This Executive Order approved the specified parts on on May 9, 1986.
As of Sunday, May 19th, 2024 this Executive Order has not been overturned or superceeded.

Approved Parts

Part NumberModelsModification
N-8A-HD1986 and older Chevrolet/GMC 454 CID heavy-duty gasoline enginesCarburetor bowl vent hose disconnected and plugged at carbon canister, OEM air cleaner and heated air intake are replaced with Airsensor air cleaner, and automatic choke and carburetor are removed.

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-163
  • Executive Order 163 / D163
  • ARB # D-163
  • Executive Order No: D-163
  • C.A.R.B. No. D-163
  • Resolution D-163
For Free CARB Executive Order Status verification, email an image of the device Executive Order label as well as the Year/Make/Model and Test Group # of the vehicle to [email protected]

Download: Executive Order D-163 PDF

D-163 Document:

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