Holley and other manufacturers have developed a program
whereby all emission-sensitive products can be identified
by placing color-coded labels on product packaging and
listing corresponding numeric codes next to each part number.
The color codes and explanations are as follows:
Green
The product accompanying this document has been
granted a California Air Resources Board (ARB)
exemption, an "EO" number, or is a direct or
consolidated replacement part. It is 50-state
legal, per the manufacturer's application guide.
Blue
The manufacturer of the product accompanying
this document represents that it has not been
found, nor is believed to be, unlawful for use
under provisions of the Clean Air Act, per
the manufacturer's application guide. This product is not legal
for sale or use in the State of California (or in states which
have adopted California emission standards) except on
pre-emission-controlled motor vehicles/motor vehicle
engines (pre-1966 model year).
Amber
The product accompanying this document is legal
only for off-highway use (except in California
or states that have adopted California emission
standards), racing use, or for use on pre-emission-
controlled motor vehicles/motor vehicle engines (pre-1966
domestic vehicles certified to California standards, pre-1968
domestic vehicles certified to federal standards, and all pre-1968
foreign vehicles), per the manufacturer's application guide.