[tubman]

I don't buy into this program at all. Racing manifolds already have no carburetor heat passages; street manifolds do. If you're an all out racer, your manifold will take care of any fuel heating problems. If you want to run on the street, you will probably need manifold heat. I'm from Minnesota so I don't know if the weather in SoCal and surrounding areas requires it, but there are better ways of doing it (removeable pieces of shim stock that can be slid over the exhaust passages after loosening the manifold bolts).

Of course, "penny's" are traditional, so if your more concerned about a "hot rod" modification that can't even be seen over street manners, proceed!