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Yes...those taps can be used for the heating circuit. They are also used for system fill on a closed radiator system with remote reservoir like on the small block cars. You can block one of the ports off. I am running webers with a period-type "COBRA" intake and the top port on my water pump is blocked off (welded shut in my case) just as they did on the race cars. It affects nothing. I don't have a heat either.. The bottom port is plumbed to the bottom of my Harrison Tank.
- Allen.
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