***Unless otherwise stated in the information provided on this site, the HEDMAN HEDDERS provided in these kits are designed for use on stock cylinder heads. The use of aftermarket cylinder heads, or cylinder heads not original equipment on the listed vehicle, may result in component or chassis interference, as well as, sparkplug clearance. Always consult the head manufacturer before purchasing headers for use on AFTERMARKET or NON-STOCK heads, or contact the Hedman Tech Department at 562.921.0404 (8-4:30pm PST M-F).**