I'm getting ready to rebuild my 312 and had planned on replacing the original fuel pump with a early 70s FE pump since I no longer have vacuum wipers. Then it occurred to me that the heater control valve is also vacuum operated. Question is, can manifold vacuum be used or would this cause the heat to vary with different amounts of vacuum as the load on the engine changes? Has anyone had success doing this in the past? Thanks, Mike

1956 Fairlane Victoria (ORREO)

 

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