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Re: 472 Cadillac engine?
You can seal up the back of the passenger head port and tap the water pump flat spot for the heater hose.
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Here is a photo of where you can tap the water pump. I think the plug on the back of the head is a standard 1" iron pipe fitting.
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1969 Custom Camper C20; Factree Air, 350/TH400/Dana 70U with C30 wheel cylinders, Disk brakes, H4 conversion, headlight relay mod, 3G 135 amp alternator. 7500 GVW
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