Approval Details

Valid E.O.


This Executive Order approved the specified parts on on October 26, 1994.
As of Friday, June 21st, 2024 this Executive Order has not been overturned or superceeded.

Approved Parts

Part NumberModels
4256A, 4256B, 4257A, 4257B, 13051993 and older GM vehicles equipped with a 283, 305, 327, 350, & 400 c.i.d. small block engine per manufacturer's application.

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-343-1
  • Executive Order 343-1 / D343-1
  • ARB # D-343-1
  • Executive Order No: D-343-1
  • C.A.R.B. No. D-343-1
  • Resolution D-343-1
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-343-1 PDF

D-343-1 Document:

Current View

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