Built your own Manifold Heater

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As long as we have not been seeing any snow or salt on the roads yet in the Midwest, I have still been enjoying some driving in my Model A's. The manifold heaters I have in my cars seem to make the interior temp comfortable enough to keep the wife happy.

We have all seen the Autolight and Otwell Manifold heaters that are made of cast iron. I am wondering if it would not be that hard to make your own manifold heater out of sheet metal for use over a standard manifold just to direct some warmed air inside of the Model A via a hole in the firewall.

Please find attached a .pdf file of some old 1932 Patented ideas for yet another style of a Model A manifold heater.

A_AUTOMOBILE_EEATER.pdf