Validity
This Executive Order approved the specified parts on on July 28, 1983.
As of Wednesday, November 27th, 2024 this Executive Order has not been overturned or superceeded.
This Executive Order approved the specified parts on on July 28, 1983.
As of Wednesday, November 27th, 2024 this Executive Order has not been overturned or superceeded.
Part Number | Models | Modification |
---|---|---|
4500 | 1978-1983 GM heavy-duty vehicles with a gross vehicles weight (GVW) over 8,500 pounds and powered by a 454 CID engine. 1977 and older GM heavy-duty vehicles with a GVW over 6,000 pounds and powered by a 4564 CID engine. 1978-1979 medium duty GM vehicles with a GVW between 6,001 and 8,500 pounds and powered by a 454 CID engines. | Replace OEM metering rods with P/N 52P & AX, install water injection and EGR P/N PF7041427 |