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:
The product accompanying this document has been granted a California Air Resources Board (CARB) exemption, an “EO” number, or is a direct or consolidated replacement part. It is 50-state legal, per the manufacturer’s application guide.
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).
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:
1965 and older U.S. manufactured California Certified vehicles
1967 and older U.S. manufactured Federally Certified vehicles
1967 and older Foreign manufactured vehicle
Racing Vehicles are vehicles that are used exclusively for racing or other forms of competition that are not registered and that may never be used on the street.