Approval Details

Valid E.O.


This Executive Order approved the specified parts on on August 16, 2005.
As of Friday, April 19th, 2024 this Executive Order has not been overturned or superceeded.

Approved Parts

1987 through 2005 model year Jeep vehicles equipped with a 4.0 liter engine, and 1976 through 1991 model year Jeep vehicles with 4.2 liter engine equipped with a Mopar Fuel Injection Conversion Kit (Executive Order D-265-21).The 4.0/4.2L Aluminum Cylinder Head is designed as a direct replacement with the following specifications: Intake valve diameter, 1.91 inches, exhaust valve diameter, 1.50 inches, and a combustion chamber volume of 57 cc. The stock rocker arms can be reinstalled without any modification.

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-592
  • Executive Order 592 / D592
  • ARB # D-592
  • Executive Order No: D-592
  • C.A.R.B. No. D-592
  • Resolution D-592
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-592 PDF

D-592 Document:

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