Sorry if I missed this, but I read through the posts pretty quickly. Did anyone mention that 68 and earlier with the 8 bolt pumps require two divider plates inside the pump housing? All I saw was the correct mention that there is only one gasket.
Also, you are much better off putting an expansion plug in the rear of the passenger side head than running the hose back to the crossover or water pump housing. All you are doing is robbing that head of coolant flow that goes from rear to front like the driver's side does. Take a look at any Pontiac service manual and note the diagram of coolant flow in the Pontiac engine.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon.
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