Yes. I still have a set on one of my cars. But I never understood why they called them "econo". Nothing about them are econo because you still need the expensive rocker set up. They do have two sets of bolt holes for the exhaust but the manifold ports are a terrible mismatch so you need expensive headers. I'm running them on a street car with one magnum manifold and one 340 manifold that have been opened up to match the ports as good as possible. Not the best flowing I'm sure but for a street car they work great and I don't have to mess with headers. Also a lot of guys milled the pedestals off of them to get the valve/rocker geometry right. Mine still have them so I used big block springs and shims to get them right.