Approval Details

Valid E.O.


This Executive Order approved the specified parts on on June 2, 1999.
As of Monday, April 15th, 2024 this Executive Order has not been overturned or superceeded.

Approved Parts

1986 through 1999 General Motors trucks equipped with the 7.4L engineThe 7.4L Cylinder Heads are designed to directly replace the stock set of cylinder heads and are manufactured out of aluminum. The Cylinder Heads include two fully assembled cylinder heads, two sets of rocker arms, a complete set of pushrods, and two valve covers. No modifications are made to the vehicle's computer or fuel delivery system.

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-481
  • Executive Order 481 / D481
  • ARB # D-481
  • Executive Order No: D-481
  • C.A.R.B. No. D-481
  • Resolution D-481
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-481 PDF

D-481 Document:

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