Steve, thanks for the insight. The hose between the snorkel and and heat shield is already removed (its in the trunk till next winter). There is a second hole on the air cleaner in order to reduce restriction at WOT high rpm. However, I would like to keep that heat shield, because I am sure it will help somewhat reduce the underhood temperature in the hot summer days. The question here is, how do I keep it from rattling? I can't see how it attaches on the heads (do not have a 69+ shop manual). Thanks D^2 Quoting Otis Davidson <otisdavidson@xxxxxxxxxxx>: > D^2, > It is used > when > the outside air is very cold,thus causing a lean fuel condition(vs. too > > rich). When the outside air is very cold,it is more dense and provides > more > > The flapper-door is something that is overlooked when a car is being > diagnosed for running overly rich. If it is stuck shut all of the time,a > car > is being fed super-hot air all of the time. ...but hey,at least there > won't > be any carburetor ice! > > Steve(bizzy with projects)from Albany,N.Y. >