Quote:
Originally Posted by 71CHEVYSHORTBED402
Pretty sure that housing is 336790, which shows for a number of truck years, including 71-72. But the switch might be different.
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Yes, the GM parts catalogs could very well list that newer style thermostat housing as a service replacement part for earlier years. The installer would simply have to put a pipe plug in the unused hole.
In fact, GM did that from the factory (pipe plug in that hole) on mid/late 70's trucks that were over the GVW threshold to be considered "heavy duty" and didn't require as much emissions equipment as cars & lower GVW trucks.