Ford 429/460 Cobra Jet Heads. D0OE-R casting. Have never been rebuilt or ported. Had them disassembled and shot blasted. Magnafluxed for cracks and came out clean other than one threaded accessory hole. Mount it on backside of engine and it wont matter. You want to try finding a cheaper set online and pay ridiculous shipping to find out theyre junk or cracked then be my guest. $2500 OBO