The Stovebolt Site Forums The Shop Area General Truck Talk Heat Riser Question

I know, the terminology is confusing to me. So what I mean to ask is: with the spring removed, is the flapper inside the exhaust manifold allowing heat into the intake manifold for warm-up proceedure (cold engine) or is it in the position to route all of the heat into the exhaust (hot engine).

Thanks for your very quick answer to my question cletis!