no I'm talking about the 302 heads for a 69 mach1.... flow damn good, and dont have any bit of smog equipment on them... even the 93 cobra heads have smog equipment on them.... we live in a world now full of the EPA, and the newer the vehicle it came off of... the more crap there is to make it run "clean" and if your vehicle isn't setup to use certain smog equipment things they put on different parts.... it'll make the engine run worse